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Symptoms 

Consider the following scenario: 

  • You install Microsoft Exchange Server 2019 Cumulative Update 12.

  • You enable Extended Protection by running the Exchange Server Extended Protection script.

  • You configure the Hybrid agent from the Exchange Control Panel (ECP).

  • You try to migrate any Microsoft Exchange 2019 mailbox from On-Premises to Online.

In this scenario, mailbox migration fails after you enable Extended Protection.

Resolution 

To fix this issue, install Cumulative Update 13 or a later cumulative update for Exchange Server 2019.

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