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Title
Mailboxes Stuck in Provisioning When Synchronizing to a Hybrid Office 365 Deployment. -
Description
When trying to synchronize a mailbox in an Office 365 Hybrid deployment. User mailboxes are not synchronizing, but the console reports "provisioning" even after long periods of time (hours/days). When looking at the Office 365 Portal there is a license assigned to the user. -
Cause
There was a change to Microsoft AD Connect that allowed it to synchronize the msExchMailboxGUID to Office 365 which prevented Office 365 from creating the mailbox. -
Resolution
To resolve this issue please exclude the msExchMailboxGUID attribute from AD Connect.
- Open the Synchonization Service
- Under connectors right-click your on-premises Active Directory connector and click Properties.
- Under Select Attributes you need to untick msExchMailboxGUID and click OK.
- Start a Full Resynchronization