“onlinemeeting cannot be null” error when creating new meeting with beta API

问题

I'm trying to create a new meeting as per the documentation:

POST https://graph.microsoft.com/beta/app/onlineMeetings

(bearer token included - works fine with other operations)

{
  "meetingType": "meetNow",
  "participants": {
    "organizer": {
      "identity": {
        "user": {
          "id": "54f84a95-91c1-49f1-8d81-4632342e2c1e"
        }
      }
    }
  },
  "startTime": "2018-10-10T14:46:02Z",
  "subject": "my meeting"
}

I get this error:

{
  "error": {
    "code": "UnknownError",
    "message": "{\"message\":\"onlinemeeting cannot be null.\"}",
    "innerError": {
      "request-id": "da54bfec-c987-4e02-b4b6-1844801d5f00",
      "date": "2018-10-18T09:52:25"
    }
  }
}

any help appreciated, thanks.

来源：https://stackoverflow.com/questions/52871568/onlinemeeting-cannot-be-null-error-when-creating-new-meeting-with-beta-api