I have a Windows 10 machine that has never, as far as I'm aware, had a Windows Hello PIN set (and has definitely never had any other form of Windows Hello set up). I've only ever signed on with a password.
In the Sign-In Options window, the Windows Hello PIN says that it is unavailable, with a link to fix it.
Clicking the link to fix the Windows Hello PIN first prompts me to log into my Microsoft account and provide two-factor authentication. Once that's done, it prompts me for the Windows Hello PIN, which is not available. The prompt for a forgotten PIN points back to the Sign-Options Window; closing out of the Windows Hello PIN prompt cancels the process of fixing the Windows Hello PIN.
(MS Office programs also apparently require me to enter the Windows Hello PIN, despite that PIN not being available.)
How can I fix the Windows Hello PIN, or log into MS Office without using Windows Hello?