Microsoft’s Windows Hello face unlock feature no longer works in dark rooms, and it’s not a bug. Microsoft quietly made the change to Windows Hello in April, in order to fix a vulnerability with Windows Hello spoofing. Fixing the security flaw has now removed key functionality from Windows Hello in Windows 11. “After installing this update or a later Windows update, for enhanced security, Windows Hello facial recognition requires color cameras to see a visible face when signing in,” says Microsoft in its April Windows Update patch notes. We’ve reached out to Microsoft to see whether the company might get Windows Hello working in the dark again in the future, and we’ll update you accordingly.