Windows 11 users are reporting a false "no antivirus detected" warning on recent builds, though Microsoft Defender remains active and fully functional despite the inaccurate security interface notification.

Key Points

• The reporting glitch affects Windows 11 versions 24H2 and 25H2, particularly those running recent Insider Release Preview builds.
• Users receive a "Turn on virus protection" notification even when Microsoft Defender or third-party antivirus software is actively running.
• The issue stems from a synchronization error between the Windows Security Center UI and the underlying security services.
• Microsoft has not yet officially acknowledged the bug on its known issues pages for the affected Windows 11 versions.
• Users can verify their actual protection status by running the "Get-MpComputerStatus" command in PowerShell or checking settings within the Windows Security app.

Why it Matters

This bug highlights the potential for UI-based reporting errors to cause unnecessary alarm regarding critical system security. While the current warning is a false positive, users should verify their protection status to ensure that genuine security failures are not overlooked.