Internal server error (500) when retriving calendars

[marcoancona]

Describe the bug
When performing a GET https://graph.microsoft.com/v1.0/me/calendars on a personal @outlook.com account the server responds with the following:

{
    "error": {
        "code": "ErrorInternalServerError",
        "message": "An internal server error occurred. The operation failed."
    }
}

To Reproduce
Steps to reproduce the behavior:

1. Go to https://developer.microsoft.com/en-us/graph/graph-explorer
2. Sign in with a real @outlook.com account
3. Run a GET query to https://graph.microsoft.com/v1.0/me/calendars
4. See error

Expected behavior
The list of calendars is returned

Screenshots
https://share.cleanshot.com/5L6jdXFm

Additional context
The error is not occurring with work O365 accounts, unless a personal Outlook calendar is shared with the work account. In this case, trying to retrieve the list of calendars from the O365 account also fails.

[davesmits]

Please have a look; I have this too and affects an app i have in the store.

[michalleptuch]

I have the same problem in my app

[zhwei]

Hi, the following answers can temporarily avoid the 500 error, hope it can help everyone.

https://learn.microsoft.com/en-us/answers/questions/2279133/getting-500-response-errors-to-get-me-calendars-al

[michalleptuch]

Unfortunately I can't avoid these properties.