I was having this problem on my laptop, and then I noticed when I logged in that under the box for the password there were now two icons: the one on the left representing a PIN (it looks like a ten-key), and the one on the right representing a password (it looks something like a password box). I had inadvertently selected the left box, and so every time I started, it wanted me to create a pin because that's what I was indicating I wanted. Make sure on your sign-in page (on startup) that the icon for password (under the password box) is selected. That worked for me.
Finally!!!
It's been driving me bananas.
Thank you ❤