Really? That's strange. I also started up a new playthrough when the official 0.7.0 came out, and the 1234 note was the passcode to my door. If the issue persists, you could do one of two things: either you can buy lights yourself to light up the hallway, or you could buy a password changer for the door. If it really isn't the code, though, and you haven't done anything to the door, I would advise reporting this as a bug in the pinned thread.