Hi @A S ,
Have you made sure you meet all the requirements to run Microsoft Defender Antivirus in passive mode?
Requirements for Microsoft Defender Antivirus to run in passive mode
In order for Microsoft Defender Antivirus to run in passive mode, endpoints must meet the following requirements:
- Operating system: Windows 10 or later; Windows Server, version 1803, or newer; or Windows Server 2019
- Microsoft Defender Antivirus must be installed
- Another non-Microsoft antivirus/antimalware product must be installed and used as the primary antivirus solution
- Endpoints must be onboarded to Defender for Endpoint
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