Windows 11 Can't Log In and Won't Let Me Set Pin

Hi all,

Just updated today to Windows 11. Upon my computer restarting, I got a 'sign in' button beneath my account instead of a box to enter my pin. When I sign in, it takes me to Microsoft account sign in and says "That Microsoft account doesn't exist". Before updating my PC, I changed the account associated with my Microsoft account to an Outlook one from the Gmail one I had been using, which is what comes up when I initially go to log in.

I go through the sign in process with my new email and it takes me to the Create a Pin screen. I click next and it says "Something went wrong. We weren't able to set up your PIN." It gives me the option to retry, which just takes me back to the "Something went wrong.", or "Skip for now", which takes me back to my computer's lock screen and makes me go through the whole process again.

What can I do to get back into my computer? I'm not reliant on it for work, but I do have important files and some games installed on there.

Thanks in advance.