For instance, Windows Hello isn’t fooled by someone holding up a photo of your face because Windows Hello facial recognition ...

It is part of the Windows Hello biometric authentication ... However, if you’ve set up Face Login with a compatible camera and now want to disable it, you can follow some easy steps.

Here, find the option called Sign in with an external camera or fingerprint reader. Finally, toggle the corresponding button to turn it ON. Read: Windows Hello Facial Recognition setup not working.