ErrorInternalServerError When Calling GET /me/calendars via Graph Explorer

Question

ErrorInternalServerError When Calling GET /me/calendars via Graph Explorer

Alexander K 20

Hello,

I’m trying to retrieve my Outlook calendars by sending the following request in Graph Explorer:

GET https://graph.microsoft.com/v1.0/me/calendars

(or via the Graph Explorer URL: https://developer.microsoft.com/graph/graph-explorer?request=me%2Fcalendars&method=GET&version=v1.0&GraphUrl=https://graph.microsoft.com)

However, every time I submit this request, I receive the following response:

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

I noticed a similar issue reported here: https://learn.microsoft.com/en-us/answers/questions/2284772/error-graphfatalserviceexception-errorinternalserv. In that case, the error resolved itself after a short time, but my request has been failing with the same error for several days.

Could you please help me understand what might be causing this internal server error and advise on any steps I can take to successfully retrieve my calendars? Any guidance or troubleshooting tips would be greatly appreciated.

Thank you for your assistance!

Accepted answer

0 additional answers

Your answer

Answer 1

Vasil Michev 119.5K MVP Volunteer Moderator

There was (or perhaps still is) an issue on Microsoft side around this, the suggested workaround was to get only the properties you are interested in via $select, specifically excluding allowedOnlineMeetingProviders and defaultOnlineMeetingProvider. Can you check if that works for you? 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

Alexander K 20 Reputation points

2025-06-18T06:48:41.6966667+00:00
Hello,

Thank you for the quick response!

Could you please clarify exactly how I should exclude those properties? Right now I’m simply calling:

GET https://graph.microsoft.com/v1.0/me/calendars Authorization: Bearer <token>

Should I add a $select query parameter to the URL - something like:

GET https://graph.microsoft.com/v1.0/me/calendars?$select=id,name,owner Authorization: Bearer <token>

and explicitly list only the fields I need? Or is there another way to omit allowedOnlineMeetingProviders and defaultOnlineMeetingProvider?

An example of the full request URL (and any additional headers) would be very helpful.

Thanks again for your assistance!
Vasil Michev 119.5K Reputation points MVP Volunteer Moderator

2025-06-18T07:00:36.9166667+00:00

The second example you provided above should work, as long as you are not specifically requesting any of the "problematic" props. There is no way to omit them unfortunately, so you have to list every property you want to get in the $select query.

Try this just to confirm whether you are affected by the same issue, or something else altogether.
Alexander K 20 Reputation points

2025-06-18T09:40:30.3266667+00:00

Thank you, it works!

Share via

ErrorInternalServerError When Calling GET /me/calendars via Graph Explorer

0 additional answers

Your answer