Changes in Outlook shared calendar appointments are not accepted

 Issue:

Changes in Outlook shared calendar appointments are not accepted, just the window close with no error but the changes are not set, also can't delete, but can add a new appointment.

The user is having full access to the shared calendar.
The issue is only in Outlook, not OWA.


Cause:

It is one of the known issues with the new shared Calendar Improvements:
Known issues with Outlook Desktop Shared Calendar Improvements - Microsoft Support


Workaround:

Creating new profile will make it work for a couple of weeks.
What we did is to deactivate the shared Calendar Improvements option and reactivate it again.

How to enable and disable the Outlook calendar sharing updates - Microsoft Support

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