Unable to Share Calendar After Migrating to Office 365

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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Vasil Michev (MVP)Commented:
Remove/readd the shared mailbox in Outlook or simply use OWA to share the calendar.
compdigit44Author 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?
Vasil Michev (MVP)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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compdigit44Author Commented:
All maiboxes are in o365
FOXActive Directory/Exchange EngineerCommented:
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.
compdigit44Author Commented:
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

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compdigit44Author 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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