I've been using Windows Hello and Microsoft accounts for login on devices for a few years. Its worked for offline for me literally many thousands of times across several devices.
I've never had the problem the GP had, but I have had Windows Hello "forget" biometrics were even configured - it's happened at least 3 times now, I guess after a Windows Update. Each time I go to login with a fingerprint, but it gives an error message and insists on the password instead, and then I have to setup Windows Hello from scratch.
