I have re-booted many times, but Biometric Devices still does not show when running Device Manager. Not to mention that I am still getting "This option is currently unavailable" when trying to enable signing-in by Face Recognition or PIN, which was the original problem.
Thanks for the advice. I have followed it and downloaded the drivers (1.4GB) and installed them by running the msi. The drivers were successfully installed, then restarted the machine. But I am still not seeing the Biometric Devices in the Device Manager's list and still getting the message "This option is currently unavailable" when trying to switch on Biometric sign-ins.