Have my lappy on win 10 and my work system on 10 as well.

This morning I tried to RDP to the work system and was plesently greeted with windows security saying my credentials don't work and the logon failed.

This is an existing setup - IP of router and 3389 fwding to my work systems local lan IP, it may have been an update, because everything else is fine - fwd stil in place, my work system's local IP is static, hasn't changed.

I'm using the admin logon to the computer, and I double checked it by (duh) signing out of my system and back on (not on a domain either)

What could cause this other than 10 and or an update?