An error occurred while saving the commentAnonymous commented
Hi Guys, not true anymore for a Hybrid environment.
Move your user mailboxes and feel free to convert them afterwards in EXO
However, we still have a limitation of writeback attributes in the sync.
So for the corresponding onprem account change this attributes to this values,
This will make the shared mailbox shown under shared mailboxes in onprem Exchange Admin Center.
All confirmed by Microsoft Support.