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I'm having trouble to add coanizer to an existing Teams OnlineMeeting.

Method PATCH to API enpoint
$"{GraphBaseUrl}v1.0/users/{anizer_id}/onlineMeetings/{meetingId}"

          var participantPayload = new
          {
            attendees = new[]
            {
              new
              {
                identity = new
                {
                  user = new { id = user_id }
                },
                upn = uUPN,
                role = role
              }
            }
          };

    "{\"attendees\":[{\"identity\":{\"user\":{\"id\":\"2f1f9f63-6085-4d76-8239-xxxxxxxxx\"}},\"upn\":\"[email protected]\",\"role\":\"coanizer\"}]}"

Getting error

{"error":{"code":"BadRequest","message":"Expected not null\r\nParameter name: onlineMeetingUserRequest","innerError":{"date":"2025-02-25T01:32:41","request-id":"8d398ca4-9300-4c62-a208-d760e6324ff1","client-request-id":"8d398ca4-9300-4c62-a208-d760e6324ff1"}}}

Thought? Thanks

I'm having trouble to add coanizer to an existing Teams OnlineMeeting.

Method PATCH to API enpoint
$"{GraphBaseUrl}v1.0/users/{anizer_id}/onlineMeetings/{meetingId}"

          var participantPayload = new
          {
            attendees = new[]
            {
              new
              {
                identity = new
                {
                  user = new { id = user_id }
                },
                upn = uUPN,
                role = role
              }
            }
          };

    "{\"attendees\":[{\"identity\":{\"user\":{\"id\":\"2f1f9f63-6085-4d76-8239-xxxxxxxxx\"}},\"upn\":\"[email protected]\",\"role\":\"coanizer\"}]}"

Getting error

{"error":{"code":"BadRequest","message":"Expected not null\r\nParameter name: onlineMeetingUserRequest","innerError":{"date":"2025-02-25T01:32:41","request-id":"8d398ca4-9300-4c62-a208-d760e6324ff1","client-request-id":"8d398ca4-9300-4c62-a208-d760e6324ff1"}}}

Thought? Thanks

Share Improve this question edited Feb 25 at 3:34 Tiny Wang 16.1k2 gold badges18 silver badges38 bronze badges asked Feb 25 at 1:34 Ph0ngvuPh0ngvu 453 bronze badges 3
  • Can you try this query – Rukmini Commented Feb 25 at 9:20
  • Check learn.microsoft/en-us/graph/api/resources/… – Rukmini Commented Feb 25 at 10:13
  • 1 Use the Prefer: include-unknown-enum-members request header – Rukmini Commented Feb 25 at 11:13
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1 Answer 1

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I've figured out the issue. The HTTPrequest needs to have 2 headers request.Headers.Add("Content-Type", "application/json"); and request.Headers.Add("Prefer", "include-unknown-enum-members");

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