Can't add fingerprint with Windows Hello - stuck at "Get Started"

History:

Swapped out motherboard on Lenovo T460P.
PIN no longer identified and biometrics flakey.
Deleted PIN and fingerprint data in Hello.
Can't add new data.

Symptoms:

When adding a new fingerprint, it goes through the usual process of asking for you to touch the biometrics reader etc. but at the end, when it prompts you for a PIN, the fingerprint is not saved, nor is the new PIN you've entered.

If you first set up a PIN, then try to add a new fingerprint, it gets to the Welcome to Windows Hello screen; when Get started is selected, it freezes.

Solution:

1. Navigate to C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft and make sure NGC security allows full access to your profile
   
2. Reboot PC and enter BIOS
   
3. Enable PTT Security (Platform Trust Security), which is also supported in Windows 8 and above (if that's not quite right, you'll find the option in the BIOS anyway).
   
4. Reboot into Windows
   
5. Windows Hello --> add new fingerprint --> follow the prompts.

It should work from now on!