To achieve that, run the following line of code in a Command Prompt (cmd.exe) window, while signed in with the user account of the person you want to delete the Windows Hello For Business registration for:
certutil.exe -DeleteHelloContainer
Afterwards, sign out to complete the action:
logoff.exe
The above two commands together, will delete all Windows Hello for Business registrations that are local to the Windows 10 device, including Windows Hello Face, Windows Hello Fingerprint and Windows Hello PIN. However, it will not remove the Security Key sign-in method, because this registration lives in Azure AD, not on the device.
After signing in successfully after deletion of the Windows Hello for Business registration, new methods can be set up for the account from Sign-in Options in the Windows Settings app.