Remote desktop - says password is wrong when it definitely isn't

I've been using remote desktop continuously up to this point. Today, out of nowhere, it begins insisting my password is wrong for the account I've been using this entire time. Check the event log and it says that the password or user was incorrect. I quintuple check the user and the password, then reset the password just to be extra sure, and it still says wrong username and password.

I've been having problems with shares as well. Never had any of these issues until I upgraded to 11. Is this thing just busted or am I missing something obvious?

Edit: Logging into accounts that aren't a Microsoft account works fine. How the heck do these work? When I type whoami on the command line I see a regular username. It looks like Microsoft is doing a bunch of magic with these things that isn't working.