Symptoms

You have migrated a user mailbox with Hybrid remote move to Microsoft Office 365 from Exchange Server 2019 or Exchange Server 2016. When you try to convert this migrated remote mailbox to a shared remote mailbox, you receive the following error message:

WARNING: An unexpected error has occurred and a Watson dump is being generated: remoteMailbox.RemoteRecipientType must include ProvisionMailbox.

Resolution

To fix this issue, install one of the following updates:

References

Learn about the  terminology that Microsoft uses to describe software updates.

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