I cant log into my desktop and nothing works

Help!! I cant log into my windows 11 desktop. I feel like ive tried everything but i keep running back into circles. It asks me to sign in so i do, and then once that happens it asks me to create a pin but then tells me that it wont work?? I dont know why this is happening, i never logged out of my account or did anything for this to happen im so confused i just want to log in and do work.