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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 Hybrid Agent (Full or Modern) from the Exchange Control Panel (ECP).

  • You check whether Hybrid Agent Validation is enabled.

In this scenario, Hybrid Agent Validation fails after you enable extended protection. 


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

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