Hi Mavis,
Thanks so much for your comprehensive reply. I wasn't terribly clear in the original post, but you seem to have understood the gist. In answer to your questions:
1. According to your description, 'now every time I try to interact with windows hello it crashes/hangs,' I'd like to know if this means that whenever you try to log in to Windows using a PIN on the Windows login screen, it results in a crash/hang? However, you could still log in to the system using your account password, right?
Maybe best explained with some examples. I can get past the windows login with Microsoft authenticator app on my phone instead, so I can at least access my machine okay. (Although randomly it asked for and allowed my pin 1 time this morning). However, windows hello is now asking me to verify my identity in multiple other apps, and I can't get past it. Outlook (desktop) for example, asks me to confirm my identity when I open it with pin, or password, but when I enter this information, it continues to ask again and again, until it simply stops responding, I cannot close the windows hello dialogue box or outlook without forcing closed through task manager. The same happens within chrome password manager, and indeed the actual settings app when I try to change the pin or set-up a local account. In both circumstances, I cannot use the apps.
2. According to the troubleshooting steps you have tried, "Reset Settings, Delete NGC file", you can log on to Windows normally, but when you set the PIN in the Setup application, an error message will appear indicating that your password is not recognized, right?
Yes, that is what was happening, but in some (inconsistent) circumstances, it does accept my password, and certainly if ever the authenticator app is an option, that seems to work.
3. If you can access the Windows system but are unable to set up a local account, does the same process still prompt you that your Microsoft account password cannot be recognized?
Yes, that is correct.
Here's a couple of videos to show what is happening, if it helps:
https://youtu.be/3LQK6K-2pzM
(Attempting to use Outlook)
https://youtu.be/hdfK1mr_C08
(Attempting to set-up local account)
I'm not sure if it's relevant, but just to point out that my 365 subscription and overall windows log-in is through one email address, outlook is asking me to confirm identity to access a different one.
I went through the command prompts, and that did work to delete ngc file, but after setting a new pin I'm having all the same problems.
Best wishes,
Nathan