Microsoft Graph API – OnlineMeeting: Organizer cannot be added as attendee

Question

Microsoft Graph API – OnlineMeeting: Organizer cannot be added as attendee

Sébastien B 0

Hello,

I’m using the Microsoft Graph API (v1.0) in C# to create Teams meetings using the onlineMeeting resource.

I need a scenario where the organizer of the meeting is also explicitly listed in the attendees collection.

However, when I include the organizer in the attendees array during creation, it is never returned in the API response.

Example payload:

POST /v1.0/me/onlineMeetings

{

"startDateTime": "2025-08-12T10:00:00Z",

"endDateTime": "2025-08-12T10:30:00Z",

"subject": "Test meeting",

"participants": {

"organizer": {

"identity": {

"user": {

"id": "ID_USER"

}

},

"attendees": [

{

"identity": {

"user": {

"id": "ID_USER"

}

},

"role": "attendee"

}

]

}

Result: The organizer is correctly set in organizer, but the attendees collection is empty. If I replace ID_USER with another user, that person appears normally in attendees.

Questions:

Is this expected behavior for onlineMeeting objects?
Is this a Teams / Graph API limitation, or a bug?
Is there any official way to explicitly include the organizer in the attendees collection so it can be retrieved via the API?

Notes:

Using the Microsoft.Graph.Event resource, the organizer can appear in attendees if explicitly added in the request.
This behavior does not seem to be documented in the onlineMeeting reference.

Thanks in advance for any clarification.

Starry Night 30 Reputation points

2025-08-12T07:35:49.7933333+00:00

You can try to request /me/onlineMeetings/createOrGetAPI, and then add the organizer to the request body. Hope this helps.
Sébastien B 0 Reputation points

2025-08-12T08:27:57.37+00:00

Hi,

Thanks for your comment.

The organizer is correctly set to the OnlineMeeting resource object. The current problem is when I try to set the Organizer as a participant too, when the OnlineMeeting is updated (PATCH), with the organizer as participant, it is not saved. But organizer is OK.

1 answer

Your answer

Starry Night 30 Reputation points

2025-08-12T07:35:49.7933333+00:00

You can try to request /me/onlineMeetings/createOrGetAPI, and then add the organizer to the request body. Hope this helps.
Sébastien B 0 Reputation points

2025-08-12T08:27:57.37+00:00

Hi,

Thanks for your comment.

The organizer is correctly set to the OnlineMeeting resource object. The current problem is when I try to set the Organizer as a participant too, when the OnlineMeeting is updated (PATCH), with the organizer as participant, it is not saved. But organizer is OK.

Answer 1

This is expected behavior for the onlineMeeting resource in Microsoft graph. In an online meeting, the participants object is split into two separate roles:

· Organizer- always exactly one user who scheduled the meeting.

· Attendees- all other participants.

When you create the meeting and include the organizer’s ID inside attendees , Graph automatically removes it during processing. This avoids duplication, because the organizer is already represented in the organize property.

This differs from event resource, where the organizer can appear in attendees if explicitly added. The behavior for onlineMeeting is currently not documented in the API reference, but it aligns with how teams models meeting participation.

Workarounds:

· If you need the organizer to appear in the same list as attendees, merge the attendees and organizer values in your client code after retrieving the meeting.

· For tracking/reporting purposes, maintain your own mapping that includes the organizer in both roles.

Summary:

· Not a bug-it’s by design

· No supported parameter exists to force this organizer into attendees for onlineMeeting.

· You must combine the lists yourself if needed.

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Microsoft Graph API – OnlineMeeting: Organizer cannot be added as attendee

1 answer

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