Ok, thats by design:
Sharing calendar from 365 to on-prem is unpredictable.
We have an account (sideA) on on-prem (Exchange 2016 cu23 + updates). And we have a hybrid environment (also with AADConnect). Sync is fine.
We have an account on 365 (sideB) with the mailbox on 365 and a license business premium.
The parameter "Set-OrganizationConfig -ACLableSyncedObjectEnabled $True" is set.
When we shared the calendar of account sideB for the account sideA, we can see the calendar. And when adding the calendar we get a popup to logon into 365 for the account sideA. So we login.
But then we keep seeing that the shared calendar of account sideB cannot be updated. So new entries are not seen.
We did already open a Microsoft case and after activating the "Set-OrganizationConfig -ACLableSyncedObjectEnabled $True" it has worked for one day. Since then, no real live view on the calendar.
We opened a new case, but now it is waiting for more info, again.
Maybe here we find some more possibilities to solve this issue?
Kind regards
Kurt
Exchange | Exchange Server | Management
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Andy David - MVP 157.8K Reputation points MVP Volunteer Moderator
2023-07-12T13:55:30.4533333+00:00