A member server has a Change Auditor Agent installed which is then promoted to a Domain Controller.
The Change Auditor Coordinator topology still sees the server as a Member Server until the next time the topology is refreshed (every 3 hours by default). As a result, the Agent does not get a full AD Plug-in configuration and AD changes go unmonitored for +-3 hours (depending on when the last topology refresh occurred) +- 15 minutes until the next Agent refresh.
The Domain Controller will not track Active Directory changes for approximately 3 hours after becoming a Domain Controller.
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