App Role assignment to service principal --

Using Ms Graph Rest API's

Permissions

One of the following permissions is required to call this API. To learn more, including how to choose permissions, see Permissions.

Permission type	Permissions (from least to most privileged)
Delegated (work or school account)	AppRoleAssignment.ReadWrite.All and Application.Read.All, AppRoleAssignment.ReadWrite.All and Directory.Read.All, Application.ReadWrite.All, Directory.ReadWrite.All
Delegated (personal Microsoft account)	Not supported.
Application	AppRoleAssignment.ReadWrite.All and Application.Read.All, AppRoleAssignment.ReadWrite.All and Directory.Read.All, Application.ReadWrite.All, Directory.ReadWrite.All

Create 2 app registrations.

App role owner will contain the app role that will be assigned to a service principal.

The reader role in approleowner will be added to the approlesubscriber

Setup postman to use the Oauth auth flow to get a token for MS Graph.

ClientId: Application (client) ID for approlesubscriber

Client Secret: secret for approlesubscriber

Scope: https://graph.microsoft.com/.default

Auth URL: https://login.microsoftonline.com/{tenantId}/oauth2/v2.0/authorize

Access Token URL: https://login.microsoftonline.com/{tenantId}/oauth2/v2.0/token

Assign the delegated permissions so that we can act on behalf of the logged in user.

Add Role Assignment

URL : https://graph.microsoft.com/v1.0/servicePrincipals/{ResourceId}/appRoleAssignedTo

PrincipalId: Approlesubscribers enterprise apps object id (to whom we assign the role)

ResourceId: Approleowners enterprise apps object id (who has the app role)

AppRoleId: Id of the app role (shown in the below image)

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