Hi Umut Topuz,
Thanks for reaching out to Microsoft!
It seems you're trying to use the User Principal Name (UPN) in the user ID field, but this API does not support UPN yet. You must use the user's ID to get the online meeting.
Here's how you can do it Use Postman with the Microsoft Graph API
- Run the following API in Postman:
https://graph.microsoft.com/v1.0/users/{UserPrincipalName}
- Copy the "Id" from the result.
- Then, run:
referring to the Create onlineMeeting documentation./users/{id}/onlineMeetings
Hope this helps.
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