Add Analyzer01 to the Event Log Readers group is correct.

The Defender for Identity sensor needs permission to read domain controller event logs so it can analyze authentication and security events. Adding Analyzer01 to the Event Log Readers group grants the sensor the required read access without giving it unnecessary elevated rights. This group membership is a standard prerequisite before you activate a standalone sensor.

Enable port mirroring on the network switch so Analyzer01 receives copies of domain controller traffic is not strictly required before activation. Port mirroring is only needed when you plan to capture network traffic for the sensor. The sensor can be activated and will function for many detections by using event log access alone.

Add Analyzer01 to the Domain Controllers group is wrong because that would give the machine full domain controller privileges. The sensor only needs read access to event logs and not full domain controller membership, so adding it to Domain Controllers would be excessive and insecure.

Open Windows Firewall on Analyzer01 to allow Remote Event Log and Remote Access connections is not the specific prerequisite for activation. Firewall rules can matter in some network setups, but the essential required step documented by Microsoft is to ensure the sensor has Event Log Readers access. Firewall changes are situational and not the universal activation requirement.

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