I Calendar Not Syncing. Check the system status of icloud contacts, calendars or reminders for services outages or connection issues. Restart the contacts, calendar or reminders.
Make sure that the users who are not seeing the appointments have the appropriate permissions to view the shared calendar. 4.on the general tab, choose clear offline items.
When Calendar Stops Syncing, Check If You Are Signed Into The Correct Outlook Account.
Remove and reconnect the shared calendar.
The First And Foremost Thing You Must Do When The Sync Feature On Icloud Calendar Doesn’t Work Is Close And Restart The Calendar App.
I have been using microsoft mail as my default email client.
It Is Been More Than A Month, Change The Device.
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Set Outlook As Your Default Calendar.
Make sure that the users who are not seeing the appointments have the appropriate permissions to view the shared calendar.