Microsoft graph api calendarview delta issues - microsoft-graph-api

Question

I am currently using the Microsoft graph API to get events from Outlook, but I would like to change to the calendarView endpoint instead. However, I am facing a number of challenges when using delta links on other users calendars with delegated access.
My first call to the delta endpoint works as intended, but when I try to use the link in #odata.nextLink for next delta data I get an permission error - and can't see what should cause this error
{
"error": {
"code": "ErrorAccessDenied",
"message": "Access is denied. Check credentials and try again.",
"innerError": {
"date": "2022-12-06T18:03:31",
"request-id": "961ca04c-0000-0000-0000-000000000000",
"client-request-id": "2dc7f5ea-0000-0000-0000-000000000000"
}
}
}
Delta querying works fine when done on the events endpoint so I am a bit lost in what to check for?

Answer 1

As you said you are facing challenges while using delta links on other users calendars with delegated access. For accessing other user data ,which required application permission , where as delegated permission required user to signIn , please check the doc for more info regarding delegated permission vs application permission .
Could you please try adding Calendars.Read application permission instead of delegated permission - https://learn.microsoft.com/en-us/graph/api/event-delta?view=graph-rest-1.0&tabs=http.
Hope this helps
Thanks

Answer 2

I ran into this issue recently and found a partial answer at https://learn.microsoft.com/en-us/answers/questions/587998/deltatoken-for-calendar-events-requiring-elevated.html
I asked my Active Directory admin to give manage access for the account associated with my bearer token, and the delta events are now working. That is, myuser#example.com now has manage permissions for shared-calendar-user#example.com. This isn't ideal, but it's acceptable for my use case.