Symptoms
Consider the following scenario:
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You install Microsoft Exchange Server 2019 Cumulative Update 12.
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You enable Extended Protection by running the Exchange Server Extended Protection script.
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You configure Hybrid Agent (Full or Modern) from the Exchange Control Panel (ECP).
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You check whether Hybrid Agent Validation is enabled.
In this scenario, Hybrid Agent Validation fails after you enable extended protection.
Resolution
To fix this issue, install Cumulative Update 13 or a later cumulative update for Exchange Server 2019.
