Can you confirm this issue on the Outlook Web App (OWA)? Meanwhile, please try sharing this problematic calendar via OWA to check the issue.
Let me make the scenario more clear to you.
The admin create a calendar and share it with USER A,
USER B with Full rights.
USER A & B gets the intimation of sharing via an email that the calendar has been shared with them with a link in it.
On clicking the link a .ics file is downloaded, on double clicking the .ics file a shared calendar is added to outlook application on the computer. entries are sync with the main calendar post this the entries never
get sync.
On the other side I have another calendar shared wih the same scenario but that get updated on a regular interval. The only difference is that only Admin can add entries and rest of the user can view.
Second the mail received by user of sharing of calendar had a link with webcal:// which added the calendar directly without downloading the .ics file, whereas the the problematic calendar had http://followed by address and downloaded the
.ics file.
Also, check if you find any report in the Sync Issues Folder by following steps mentioned below and post back the same:
a) Open Outlook > press Ctrl + 6 keys to change the view to folders list.
b) Now go to Sync Issues folder and check if you’re able to find any report.
I did this step but the folder was empty
Moreover, please update the Outlook version to the latest one to check the issue. if issue persists, provide us the detailed version of Outlook.
I have got tested the same on all the version of outlook but did not helped.
Regards,
Rudy