Teams listChannel Graph API resulting in "Unauthorized error - "Failed to execute Aad backend request GetUsersByObjectIdsRequest"

Question

The teams list channel Graph API has started throw Unauthorized error as below. It use to work fine until yesterday. We are using "ServicePrincipal" for authentication and it has all necessary graph permission. In this case - Group.Read.All

Sample endpoint we are using is as below. https://graph.microsoft.com/v1.0/teams/dccde580-0fc5-11eb-adc1-0242ac120002/channels.

Since this morning, it is failing continuously with the below error. More over, this is not a beta API.

As per our analysis, it is failing for those teams which has a private channel it. But as per documentation, private channels should be returned in the response as well. I dont understand what could be the issue.

Any idea / hints /help in this regard is really appreciated.

{
  "error": {
    "code": "Unauthorized",
    "message": "Failed to execute Aad backend request GetUsersByObjectIdsRequest. Workload Unknown. Request Url: https://graph.windows.net/myorganization/getObjectsByObjectIds?api-version=1.61-internal, Request Method: POST, Response Status Code: Unauthorized, Response Headers: ocp-aad-diagnostics-server-name: 0yK5pQbb6mmQTig21hH07WmGI0k2nuTime8Zw4wMO7k=\r\nrequest-id: c33c655e-27f7-4f96-aabf-70e6d9d8770d\r\nclient-request-id: 5bd775a7-7dba-4ad7-bc9a-fbd91ae46fea\r\nStrict-Transport-Security: max-age=31536000; includeSubDomains\r\nDate: Fri, 16 Oct 2020 15:23:45 GMT\r\n, Reason Phrase: Unauthorized",
    "innerError": {
      "date": "2020-10-16T15:23:45",
      "request-id": "3f3793b8-02d6-4653-a14f-3e455660e3d8",
      "client-request-id": "3f3793b8-02d6-4653-a14f-3e455660e3d8"
    }
  }
}

Answer 1

We are facing the same issue, and the error exist in some of our test tenants and it will thrown by microsoft when we using the application permission to make the request. The requests with the delegate permission token work without any issue.