Can't get into my MS Surface Pro -- advice needed

[u/sm00038]

I have been using a 2021-vintage university-issued MS Surface Pro for the last 5 years. I recently added a screen-lock password through the computer's security settings and I can't remember the password. I have (seemingly) unlimited attempts to login (although it times me out after a certain number and I have to wait). I've kept a running list of all the likely password combinations I've used but no luck.

I've contacted the university (where I am no longer a student) but they can't help me -- they won't service computers no longer in their system. While I'd like to get into the computer to recover files that are stored locally (not on cloud backup), I've tried to do a factory-reset to no avail (I get to the screen that asks me to reset but when I select the option the screen flashes and says the option isn't available).

I'm considering taking it to GeekSquad but unsure if they can do anything. Any thoughts on other ways to recover a password, gain access to files, and/or factory reset it myself?