Hmmm. it was working fine a couple of months ago, now i get
[Exchange Web Services]Synchronizing folder ‘Other Calendars/Calendar’ failed due to the following error: Access is denied. Check credentials and try again., ICS synchronization failed.
I also get many errors when I open a calendar item that was added by other staff - it’s always trying to EDIT when all i really wanted to do was view…
This sounds like a Microsoft exchange shared calendar issue and would suggest to contact them via their Community forum or Microsoft technical staff directly by phone if you are a paid customer.