I've enrolled my fingerprints via the Windows 8.1 PC user settings app.

When I logon to my PC it provides the usual password box to type my password, but if I swipe the fingerprint reader nothing happens. I've registered four fingers, none of them work.

Are there some other settings I need to change to enable use of the fingerprint reader?

I see the biometric device in device manager, and registering fingerprints is no problem, it's just during logon that it's not working.

Thanks for any advice.