Windows Hello is a feature where biometric data is used to sign in to Windows 10/11 without requiring a password. Biometric data can come from using a fingerprint sensor or facial recognition. Facial recognition requires an infrared sensor in a camera.
More information about Windows Hello on Microsoft.com.
Elgato Facecam, Facecam MK.2, and Facecam Pro do not have built-in infrared sensors and do not work with Windows Hello.