Just had a bizarre experience with my laptop password that I wanted to share in case it helps anyone else! My go-to password, which I've used for three years and was visibly entering correctly, suddenly stopped working. Talk about frustrating!
Official WebsiteTurns out, Skype and Microsoft had somehow synchronized without my knowledge, and my laptop login password had silently updated to my Skype password. A little unnerving that it happened without an alert, but I'm relieved to have figured it out. Definitely something to keep in mind if you're ever locked out!