Unable to Share Calendar After Migrating to Office 365

compdigit44
compdigit44 used Ask the Experts™
on
We have a number of Admin who manage our Exec's and resource calendars. Prior to migrating to Office 365 they were able to share the calendar of another mailbox the have full access to. Now after moving to Office 365 the option to share the calendar is grayed out and only have the option to Email the calendar and have confirmed the user has full access and send as permissions to all mailboxes attached.
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Most Valuable Expert 2015
Distinguished Expert 2018

Commented:
Remove/readd the shared mailbox in Outlook or simply use OWA to share the calendar.

Author

Commented:
Already tried to remove and read the mailbox no luck. Is it possible this cannot be done with o365 since the server is not onprem?
Most Valuable Expert 2015
Distinguished Expert 2018

Commented:
You have to be more specific here, but yes, if one of the mailboxes is in O365 and the other one on-premises, it will not work.
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Author

Commented:
All maiboxes are in o365
FOXActive Directory/Exchange Engineer
Top Expert 2015

Commented:
Comp,
1. The shared mailboxes and the user mailboxes should both be sitting on O365.
2. As stated in previous comments, remove and readd the shared mailbox to outlook.  If that doesn't work-
3. Remove a user and then readd them with full access to the shared mailbox and test.
We contact MS support and they stated the Share Ca lender button is Outlook s grey out by design after moving to Office 365 and the only way to share the calendar other than your own is to share if via OWA which does work. I hope this helps other out there

Author

Commented:
Called MS support to get to the bottom of this issue and wanted to post their finding to help other in the future

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