Per this page (https://learn.microsoft.com/en-us/graph/outlook-calendar-online-meetings?tabs=http), when creating an event it should return
"onlineMeeting": {"joinUrl": "https...","conferenceId": "291633251","tollNumber": "+1 323-555-0166"}
I am instead receiving:
"onlineMeeting": {"joinUrl": "https...",}
I get the same issue when getting an existing event (https://learn.microsoft.com/en-us/graph/api/onlinemeeting-get?view=graph-rest-1.0&tabs=http)
Seems related to this question, but this issue is not fixed for me: Microsoft Graph API Creating Event no longer returning conferenceId