Windows just started needing my password to log-on (instead of my PIN)?

I woke up this morning and for some reason, when resuming my computer from sleep, it now requires me to enter my password instead of my PIN. I haven't updated anything that I know of, so I don't know what's up?

Is there a reason this would happen? A way to fix it?

from Windows Central Forums http://ift.tt/2boiSqT
via IFTTT