I have this issue also.
This has happened a few times in the past as well. In those instances I have been able to go through the forgot PIN process, get a code via email, then reset (or even cancel the pin reset) to get logged in. This time, when I try to reset the PIN, it says it failed to reset. if I click "skip for now" it just brings me back to the login screen and I have to start over.
I'm thinking that there might be a time sync component to this. I noticed that the time shown on the login screen is showing the wrong date/time. This might be what is preventing the PIN login, or perhaps what is preventing the PIN reset process from completing. I tried going into the BIOS and setting the time to the correct date/time. if I save the settings and reset, then go back into bios, it shows the right time. I can do this multiple times. But as soon as I let it boot to windows, it boots up showing jan 1 2117 again. When I restart and go back into the bios, it is set incorrectly again. I'm confident this is related, but can't for the life of me get it to keep the value. I don't understand how its getting reset only when it boots to windows.
EDIT: After setting the date in the bios, booting to windows (wrong date/time shown), then letting it sit for a few minutes, the date/time updated itself to what I had set in the BIOS. Then when I went through the PIN reset process, it no longer gave me the error about being unable to reset the PIN, and I could set it back to my previous PIN.
So if you are having this issue, make sure your BIOS date/time is set correctly, it may help you.