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Windows Security app displaying a false Microsoft Defender Antivirus turned off warning

Microsoft Tells Users to Ignore False 'Antivirus Is Turned Off' Alerts

Microsoft has confirmed a known issue in which recent Microsoft Defender Antivirus updates trigger false "Microsoft Defender Antivirus is turned off" alerts in the Windows Security app, even though the antivirus is running normally. The bug affects all supported Windows client and server versions, including Windows 11 26H1 and Windows Server 2025, and a fix is still pending.