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I am getting a 500 error when trying to access the graph API, specifically I am trying to get the calendars for the test user. I see the error programmatically (C#) and also in the graph explorer.
There is an ongoing issue on Microsoft side around this, the suggested workaround is to get only the properties you are interested in via $select, excluding allowedOnlineMeetingProviders and defaultOnlineMeetingProvider.
Here's one of the "original" threads where you can get more details: https://learn.microsoft.com/en-us/answers/questions/2279133/getting-500-response-errors-to-get-me-calendars-al?comment=question#comment-2054548
Using the work around I can now retrieve the calendars however I still get a 500 error when adding an event to a calendar, there does not seem to be a mechanism to change the fields returned when posting an event:
Event? insertedEvent = await _graphClient.Users[_calendarUserId].Calendars[calendarId].Events.PostAsync(insertEvent);
You can try creating an event without online meeting, if that's an option. But as the fix for the issue is still being deployed, you might have to wait a bit otherwise. Here is the latest update:
Title: Users can't get some calendar information through Graph APIs in various Microsoft 365 services and receive a 500 error User impact: Users can't get some calendar information through Graph APIs in various Microsoft 365 services and receive a 500 error. Current status: We've initiated the deployment of our fix, and thus far it has completed to 51 percent of the affected environment. At this time, some users may begin to see relief. We're monitoring its progress as it continues to saturate throughout the affected environment and will provide an estimation for completion and impact resolution with our next scheduled update. Scope of impact: Your organization is affected by this event, and some users attempting to get calendar information through Graph APIs are impacted. Start time: Monday, May 26, 2025, at 12:00 PM UTC Root cause: Changes related to deprecating Skype introduced a conflict within the code leveraged during the retrieval of some calendar information through Graph APIs, which is resulting in impact. Next update by: Thursday, June 26, 2025, at 5:00 PM UTC