Hi, good day!
This is possible with facial recognition only if Windows Hello detects a compatible camera. Unfortunately, standard USB webcams will not work. It must support Windows Hello, which requires infrared (IR) or depth-sensing hardware. Some external USB cameras are designed for this and will work, but most regular webcams do not.
What is the exact make and model of your External USB camera?
I look forward to receiving your update and I'm willing to collaborate with you till we resolve the issue. Do keep me informed by clicking "Add comment" below.