Calendar Could Not Be Updated Outlook. (1) resolved the issue by disabling microsoft 365 features. Suddenly in the last few days some users are unable to view other users' calendars (they get the red exclamation mark in outlook with a message saying could not be updated).

Unsure at this time if it translates to the web version. To further check this issue, request you to please kindly provide us your outlook version details by providing your.