Microsoft Graph Invitations

Microsoft Graph Invitations is a Microsoft Graph API feature that lets apps programmatically invite external (B2B) users into a Microsoft Entra ID tenant. By calling POST /invitations, it creates a guest user and can send an email invitation with a redemption link, or you can suppress the email and use the returned inviteRedeemUrl to deliver the link yourself.

OpenAPI Specification

invitations-openapi-original.yml Raw ↑
openapi: 3.1.0
info:
  title: Microsoft Graph Invitations
  description: Needs a description.
paths:
  /invitations:
    description: Provides operations to manage the collection of invitation entities.
    get:
      tags:
        - Invitations.invitation
      summary: Microsoft Graph Get entities from invitations
      operationId: invitations.invitation.ListInvitation
      parameters:
        - $ref: '#/components/parameters/top'
        - $ref: '#/components/parameters/skip'
        - $ref: '#/components/parameters/search'
        - $ref: '#/components/parameters/filter'
        - $ref: '#/components/parameters/count'
        - name: $orderby
          in: query
          description: Order items by property values
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
        - name: $select
          in: query
          description: Select properties to be returned
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
        - name: $expand
          in: query
          description: Expand related entities
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
      responses:
        2XX:
          $ref: '#/components/responses/microsoft.graph.invitationCollectionResponse'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-pageable:
        nextLinkName: '@odata.nextLink'
        operationName: listMore
      x-ms-docs-operation-type: operation
    post:
      tags:
        - Invitations.invitation
      summary: Microsoft Graph Create invitation
      description: >-
        Use this API to create a new invitation or reset the redemption status
        for a guest user who already redeemed their invitation. The invitation
        adds the external user to the organization as part of B2B collaboration.
        B2B collaboration is supported in both Microsoft Entra External ID in
        workforce and external tenants. When creating a new invitation, you have
        several options available:
      externalDocs:
        description: Find more info here
        url: >-
          https://learn.microsoft.com/graph/api/invitation-post?view=graph-rest-1.0
      operationId: invitations.invitation.CreateInvitation
      requestBody:
        description: New entity
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/microsoft.graph.invitation'
        required: true
      responses:
        2XX:
          description: Created entity
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.invitation'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
  /invitations/$count:
    description: Provides operations to count the resources in the collection.
    get:
      tags:
        - Invitations.invitation
      summary: Microsoft Graph Get the number of the resource
      operationId: invitations.GetCount-8ff1
      parameters:
        - $ref: '#/components/parameters/search'
        - $ref: '#/components/parameters/filter'
      responses:
        2XX:
          $ref: '#/components/responses/ODataCountResponse'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
  /invitations/invitedUser:
    description: >-
      Provides operations to manage the invitedUser property of the
      microsoft.graph.invitation entity.
    get:
      tags:
        - Invitations.user
      summary: Microsoft Graph Get invitedUser from invitations
      description: >-
        The user created as part of the invitation creation. Read-only. The id
        property is required in the request body to reset a redemption status.
      operationId: invitations.GetInvitedUser
      parameters:
        - name: $select
          in: query
          description: Select properties to be returned
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
        - name: $expand
          in: query
          description: Expand related entities
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
      responses:
        2XX:
          description: Retrieved navigation property
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.user'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
  /invitations/invitedUser/mailboxSettings:
    get:
      tags:
        - Invitations.user
      summary: Microsoft Graph Get mailboxSettings property value
      description: >-
        Settings for the primary mailbox of the signed-in user. You can get or
        update settings for sending automatic replies to incoming messages,
        locale, and time zone. Returned only on $select.
      operationId: invitations.invitedUser.GetMailboxSettings
      parameters:
        - name: $select
          in: query
          description: Select properties to be returned
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
        - name: $expand
          in: query
          description: Expand related entities
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
      responses:
        2XX:
          description: Entity result.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.mailboxSettings'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
    patch:
      tags:
        - Invitations.user
      summary: Microsoft Graph Update property mailboxSettings value.
      operationId: invitations.invitedUser.UpdateMailboxSettings
      requestBody:
        description: New property values
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/microsoft.graph.mailboxSettings'
        required: true
      responses:
        2XX:
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.mailboxSettings'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
  /invitations/invitedUser/serviceProvisioningErrors:
    get:
      tags:
        - Invitations.user
      summary: Microsoft Graph Get serviceProvisioningErrors property value
      description: >-
        Errors published by a federated service describing a nontransient,
        service-specific error regarding the properties or link from a user
        object.  Supports $filter (eq, not, for isResolved and serviceInstance).
      operationId: invitations.invitedUser.ListServiceProvisioningErrors
      parameters:
        - $ref: '#/components/parameters/top'
        - $ref: '#/components/parameters/skip'
        - $ref: '#/components/parameters/search'
        - $ref: '#/components/parameters/filter'
        - $ref: '#/components/parameters/count'
        - name: $orderby
          in: query
          description: Order items by property values
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
        - name: $select
          in: query
          description: Select properties to be returned
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
        - name: $expand
          in: query
          description: Expand related entities
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
      responses:
        2XX:
          $ref: >-
            #/components/responses/microsoft.graph.serviceProvisioningErrorCollectionResponse
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-pageable:
        nextLinkName: '@odata.nextLink'
        operationName: listMore
  /invitations/invitedUser/serviceProvisioningErrors/$count:
    description: Provides operations to count the resources in the collection.
    get:
      tags:
        - Invitations.user
      summary: Microsoft Graph Get the number of the resource
      operationId: invitations.invitedUser.ServiceProvisioningErrors.GetCount-df29
      parameters:
        - $ref: '#/components/parameters/search'
        - $ref: '#/components/parameters/filter'
      responses:
        2XX:
          $ref: '#/components/responses/ODataCountResponse'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
  /invitations/invitedUserSponsors:
    description: >-
      Provides operations to manage the invitedUserSponsors property of the
      microsoft.graph.invitation entity.
    get:
      tags:
        - invitations.directoryObject
      summary: Microsoft Graph Get invitedUserSponsors from invitations
      description: >-
        The users or groups who are sponsors of the invited user. Sponsors are
        users and groups that are responsible for guest users' privileges in the
        tenant and for keeping the guest users' information and access up to
        date.
      operationId: invitations.ListInvitedUserSponsors
      parameters:
        - $ref: '#/components/parameters/top'
        - $ref: '#/components/parameters/skip'
        - $ref: '#/components/parameters/search'
        - $ref: '#/components/parameters/filter'
        - $ref: '#/components/parameters/count'
        - name: $orderby
          in: query
          description: Order items by property values
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
        - name: $select
          in: query
          description: Select properties to be returned
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
        - name: $expand
          in: query
          description: Expand related entities
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
      responses:
        2XX:
          $ref: >-
            #/components/responses/microsoft.graph.directoryObjectCollectionResponse
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-pageable:
        nextLinkName: '@odata.nextLink'
        operationName: listMore
      x-ms-docs-operation-type: operation
  /invitations/invitedUserSponsors/{directoryObject-id}:
    description: >-
      Provides operations to manage the invitedUserSponsors property of the
      microsoft.graph.invitation entity.
    get:
      tags:
        - invitations.directoryObject
      summary: Microsoft Graph Get invitedUserSponsors from invitations
      description: >-
        The users or groups who are sponsors of the invited user. Sponsors are
        users and groups that are responsible for guest users' privileges in the
        tenant and for keeping the guest users' information and access up to
        date.
      operationId: invitations.GetInvitedUserSponsors
      parameters:
        - name: $select
          in: query
          description: Select properties to be returned
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
        - name: $expand
          in: query
          description: Expand related entities
          style: form
          explode: false
          schema:
            uniqueItems: true
            type: array
            items:
              type: string
      responses:
        2XX:
          description: Retrieved navigation property
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.directoryObject'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
    parameters:
      - name: directoryObject-id
        in: path
        description: The unique identifier of directoryObject
        required: true
        schema:
          type: string
        x-ms-docs-key-type: directoryObject
  /invitations/invitedUserSponsors/$count:
    description: Provides operations to count the resources in the collection.
    get:
      tags:
        - invitations.directoryObject
      summary: Microsoft Graph Get the number of the resource
      operationId: invitations.invitedUserSponsors.GetCount-648d
      parameters:
        - $ref: '#/components/parameters/search'
        - $ref: '#/components/parameters/filter'
      responses:
        2XX:
          $ref: '#/components/responses/ODataCountResponse'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
components:
  schemas:
    microsoft.graph.invitation:
      allOf:
        - $ref: '#/components/schemas/microsoft.graph.entity'
        - title: invitation
          required:
            - '@odata.type'
          type: object
          properties:
            invitedUserDisplayName:
              type: string
              description: The display name of the user being invited.
              nullable: true
            invitedUserEmailAddress:
              type: string
              description: >-
                The email address of the user being invited. Required. The
                following special characters aren't permitted in the email
                address:Tilde (~)Exclamation point (!)Number sign (#)Dollar sign
                ($)Percent (%)Circumflex (^)Ampersand (&)Asterisk (*)Parentheses
                (( ))Plus sign (+)Equal sign (=)Brackets ([ ])Braces ({
                })Backslash (/)Slash mark (/)Pipe (/|)Semicolon (;)Colon
                (:)Quotation marks (')Angle brackets (< >)Question mark (?)Comma
                (,)However, the following exceptions apply:A period (.) or a
                hyphen (-) is permitted anywhere in the user name, except at the
                beginning or end of the name.An underscore (_) is permitted
                anywhere in the user name, including at the beginning or end of
                the name.
            invitedUserMessageInfo:
              anyOf:
                - $ref: '#/components/schemas/microsoft.graph.invitedUserMessageInfo'
                - type: object
                  nullable: true
              description: >-
                Contains configuration for the message being sent to the invited
                user, including customizing message text, language, and cc
                recipient list.
            invitedUserType:
              type: string
              description: >-
                The userType of the user being invited. By default, this is
                Guest. You can invite as Member if you're a company
                administrator.
              nullable: true
            inviteRedeemUrl:
              type: string
              description: The URL the user can use to redeem their invitation. Read-only.
              nullable: true
            inviteRedirectUrl:
              type: string
              description: >-
                The URL the user should be redirected to after the invitation is
                redeemed. Required.
            resetRedemption:
              type: boolean
              description: >-
                Reset the user's redemption status and reinvite a user while
                retaining their user identifier, group memberships, and app
                assignments. This property allows you to enable a user to
                sign-in using a different email address from the one in the
                previous invitation. When true, the invitedUser/id relationship
                is required. For more information about using this property, see
                Reset redemption status for a guest user.
              nullable: true
            sendInvitationMessage:
              type: boolean
              description: >-
                Indicates whether an email should be sent to the user being
                invited. The default is false.
              nullable: true
            status:
              type: string
              description: >-
                The status of the invitation. The possible values are:
                PendingAcceptance, Completed, InProgress, and Error.
              nullable: true
            invitedUser:
              anyOf:
                - $ref: '#/components/schemas/microsoft.graph.user'
                - type: object
                  nullable: true
              description: >-
                The user created as part of the invitation creation. Read-only.
                The id property is required in the request body to reset a
                redemption status.
              x-ms-navigationProperty: true
            invitedUserSponsors:
              type: array
              items:
                $ref: '#/components/schemas/microsoft.graph.directoryObject'
              description: >-
                The users or groups who are sponsors of the invited user.
                Sponsors are users and groups that are responsible for guest
                users' privileges in the tenant and for keeping the guest users'
                information and access up to date.
              x-ms-navigationProperty: true
            '@odata.type':
              type: string
      x-ms-discriminator-value: '#microsoft.graph.invitation'
    microsoft.graph.user:
      allOf:
        - $ref: '#/components/schemas/microsoft.graph.directoryObject'
        - title: user
          required:
            - '@odata.type'
          type: object
          properties:
            aboutMe:
              type: string
              description: >-
                A freeform text entry field for the user to describe themselves.
                Returned only on $select.
              nullable: true
            accountEnabled:
              type: boolean
              description: >-
                true if the account is enabled; otherwise, false. This property
                is required when a user is created. Returned only on $select.
                Supports $filter (eq, ne, not, and in).
              nullable: true
            ageGroup:
              type: string
              description: >-
                Sets the age group of the user. Allowed values: null, Minor,
                NotAdult, and Adult. For more information, see legal age group
                property definitions. Returned only on $select. Supports $filter
                (eq, ne, not, and in).
              nullable: true
            assignedLicenses:
              type: array
              items:
                $ref: '#/components/schemas/microsoft.graph.assignedLicense'
              description: >-
                The licenses that are assigned to the user, including inherited
                (group-based) licenses. This property doesn't differentiate
                between directly assigned and inherited licenses. Use the
                licenseAssignmentStates property to identify the directly
                assigned and inherited licenses. Not nullable. Returned only on
                $select. Supports $filter (eq, not, /$count eq 0, /$count ne 0).
            assignedPlans:
              type: array
              items:
                $ref: '#/components/schemas/microsoft.graph.assignedPlan'
              description: >-
                The plans that are assigned to the user. Read-only. Not
                nullable. Returned only on $select. Supports $filter (eq and
                not).
            authorizationInfo:
              anyOf:
                - $ref: '#/components/schemas/microsoft.graph.authorizationInfo'
                - type: object
                  nullable: true
            birthday:
              pattern: >-
                ^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$
              type: string
              description: >-
                The birthday of the user. The Timestamp type represents date and
                time information using ISO 8601 format and is always in UTC. For
                example, midnight UTC on Jan 1, 2014, is 2014-01-01T00:00:00Z.
                Returned only on $select.
              format: date-time
            businessPhones:
              type: array
              items:
                type: string
              description: >-
                The telephone numbers for the user. NOTE: Although it's a string
                collection, only one number can be set for this property.
                Read-only for users synced from the on-premises directory.
                Returned by default. Supports $filter (eq, not, ge, le,
                startsWith).
            city:
              type: string
              description: >-
                The city where the user is located. Maximum length is 128
                characters. Returned only on $select. Supports $filter (eq, ne,
                not, ge, le, in, startsWith, and eq on null values).
              nullable: true
            companyName:
              type: string
              description: >-
                The name of the company that the user is associated with. This
                property can be useful for describing the company that a guest
                comes from. The maximum length is 64 characters.Returned only on
                $select. Supports $filter (eq, ne, not, ge, le, in, startsWith,
                and eq on null values).
              nullable: true
            consentProvidedForMinor:
              type: string
              description: >-
                Sets whether consent was obtained for minors. Allowed values:
                null, Granted, Denied, and NotRequired. For more information,
                see legal age group property definitions. Returned only on
                $select. Supports $filter (eq, ne, not, and in).
              nullable: true
            country:
              type: string
              description: >-
                The country or region where the user is located; for example, US
                or UK. Maximum length is 128 characters. Returned only on
                $select. Supports $filter (eq, ne, not, ge, le, in, startsWith,
                and eq on null values).
              nullable: true
            createdDateTime:
              pattern: >-
                ^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$
              type: string
              description: >-
                The date and time the user was created, in ISO 8601 format and
                UTC. The value can't be modified and is automatically populated
                when the entity is created. Nullable. For on-premises users, the
                value represents when they were first created in Microsoft Entra
                ID. Property is null for some users created before June 2018 and
                on-premises users that were synced to Microsoft Entra ID before
                June 2018. Read-only. Returned only on $select. Supports $filter
                (eq, ne, not , ge, le, in).
              format: date-time
              nullable: true
            creationType:
              type: string
              description: >-
                Indicates whether the user account was created through one of
                the following methods:  As a regular school or work account
                (null). As an external account (Invitation). As a local account
                for an Azure Active Directory B2C tenant (LocalAccount). Through
                self-service sign-up by an internal user using email
                verification (EmailVerified). Through self-service sign-up by a
                guest signing up through a link that is part of a user flow
                (SelfServiceSignUp). Read-only.Returned only on $select.
                Supports $filter (eq, ne, not, in).
              nullable: true
            customSecurityAttributes:
              anyOf:
                - $ref: >-
                    #/components/schemas/microsoft.graph.customSecurityAttributeValue
                - type: object
                  nullable: true
              description: >-
                An open complex type that holds the value of a custom security
                attribute that is assigned to a directory object. Nullable.
                Returned only on $select. Supports $filter (eq, ne, not,
                startsWith). The filter value is case-sensitive. To read this
                property, the calling app must be assigned the
                CustomSecAttributeAssignment.Read.All permission. To write this
                property, the calling app must be assigned the
                CustomSecAttributeAssignment.ReadWrite.All permissions. To read
                or write this property in delegated scenarios, the admin must be
                assigned the Attribute Assignment Administrator role.
            department:
              type: string
              description: >-
                The name of the department in which the user works. Maximum
                length is 64 characters. Returned only on $select. Supports
                $filter (eq, ne, not , ge, le, in, and eq on null values).
              nullable: true
            deviceEnrollmentLimit:
              maximum: 2147483647
              minimum: -2147483648
              type: number
              description: >-
                The limit on the maximum number of devices that the user is
                permitted to enroll. Allowed values are 5 or 1000.
              format: int32
            displayName:
              type: string
              description: >-
                The name displayed in the address book for the user. This value
                is usually the combination of the user's first name, middle
                initial, and family name. This property is required when a user
                is created and it can't be cleared during updates. Maximum
                length is 256 characters. Returned by default. Supports $filter
                (eq, ne, not , ge, le, in, startsWith, and eq on null values),
                $orderby, and $search.
              nullable: true
            employeeHireDate:
              pattern: >-
                ^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$
              type: string
              description: >-
                The date and time when the user was hired or will start work in
                a future hire. Returned only on $select. Supports $filter (eq,
                ne, not , ge, le, in).
              format: date-time
              nullable: true
            employeeId:
              type: string
              description: >-
                The employee identifier assigned to the user by the
                organization. The maximum length is 16 characters. Returned only
                on $select. Supports $filter (eq, ne, not , ge, le, in,
                startsWith, and eq on null values).
              nullable: true
            employeeLeaveDateTime:
              pattern: >-
                ^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$
              type: string
              description: >-
                The date and time when the user left or will leave the
                organization. To read this property, the calling app must be
                assigned the User-LifeCycleInfo.Read.All permission. To write
                this property, the calling app must be assigned the
                User.Read.All and User-LifeCycleInfo.ReadWrite.All permissions.
                To read this property in delegated scenarios, the admin needs at
                least one of the following Microsoft Entra roles: Lifecycle
                Workflows Administrator (least privilege), Global Reader. To
                write this property in delegated scenarios, the admin needs the
                Global Administrator role. Supports $filter (eq, ne, not , ge,
                le, in). For more information, see Configure the
                employeeLeaveDateTime property for a user.
              format: date-time
              nullable: true
            employeeOrgData:
              anyOf:
                - $ref: '#/components/schemas/microsoft.graph.employeeOrgData'
                - type: object
                  nullable: true
              description: >-
                Represents organization data (for example, division and
                costCenter) associated with a user. Returned only on $select.
                Supports $filter (eq, ne, not , ge, le, in).
            employeeType:
              type: string
              description: >-
                Captures enterprise worker type. For example, Employee,
                Contractor, Consultant, or Vendor. Returned only on $select.
                Supports $filter (eq, ne, not , ge, le, in, startsWith).
              nullable: true
            externalUserState:
              type: string
              description: >-
                For a guest invited to the tenant using the invitation API, this
                property represents the invited user's invitation status. For
                invited users, the state can be PendingAcceptance or Accepted,
                or null for all other users. Returned only on $select. Supports
                $filter (eq, ne, not , in).
              nullable: true
            externalUserStateChangeDateTime:
              pattern: >-
                ^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$
              type: string
              description: >-
                Shows the timestamp for the latest change to the
                externalUserState property. Returned only on $select. Supports
                $filter (eq, ne, not , in).
              format: date-time
              nullable: true
            faxNumber:
              type: string
              description: >-
                The fax number of the user. Returned only on $select. Supports
                $filter (eq, ne, not , ge, le, in, startsWith, and eq on null
                values).
              nullable: true
            givenName:
              type: string
              description: >-
                The given name (first name) of the user. Maximum length is 64
                characters. Returned by default. Supports $filter (eq, ne, not ,
                ge, le, in, startsWith, and eq on null values).
              nullable: true
            hireDate:
              pattern: >-
                ^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$
              type: string
    

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# Full source: https://raw.githubusercontent.com/api-evangelist/microsoft-graph/refs/heads/main/openapi/invitations-openapi-original.yml