Open and navigate to: C:\Windows\System32\WinBioPlugIns\FaceDriver .
This is a driver signature issue. The Windows Hello Face Software Driver has been disabled because of a driver integrity failure or a conflicting third-party camera application (like Discord or Zoom) that held exclusive control of the IR sensor. windows hello face software driver
When the driver receives a frame, it doesn't just look for a face. It looks for: windows hello face software driver