If they use GoDaddy for 365, and they forgot their password, and their PIN, just have them give GoDaddy a call and have that users 365 password reset. And make sure they jot down that pasword.
The PIN is tied to Windows Hello, and is unique per device, and set on the device. The PIN is not configurable at the 365 account, it's changed locally on the device, unique per device. Once the user knows their 365 password, they can then log into the computer (you'll have a choice to skip the PIN and sign in with a password).....and then they can go to the computers Hello config (sign in options) and although they won't be able to "change" their PIN (because it will require them to type in the old one), they can do the "forgot my PIN" option, or they can remove the PIN...and then create a new one. The "Forgot my PIN" option simply challenges for 365 authentication (and hopefully MFA)..and then it's a quick change after that.