I have been working with a bunch of Surface Pro 4 computers at work. Facial recognition worked great while setting them all up. After changing privacy settings and adding other users Windows 10 no longer logs me or the other staff members into our accounts.

I power on the tablets, they scan my face, says " Hello(my username)", but no longer logs me or the other user into windows. We have to swipe the screen and type our login information.

Any pointers how to get Windows Hello Working correctly again?

Thanks in advance!