Can't access all calendars for my users
Trying with Graph Explorer
[https://graph.microsoft.com/v1.0/me/calendars] just works fine and gives me the colanders.
Whereas [ https://graph.microsoft.com/v1.0/users/UPAN/calendars ] always giving 404 status code
"code": "ErrorItemNotFound",
"message": "The specified object was not found in the store.",
But when the user opened his calendar, he was able to see all three calendars from his Outlook.