abistasiasims The period in the email address is probably fine, or else we'd have heard about it before. It's a common-enough move. I do wonder about the space though. You could test in another new admin Windows account (that you could delete when you were done), creating a new username similar to your main one, like lastname firstname with the space.
I realize this is a lot of testing, but at the very least, you can stop doing so whenever you want, for the moment or permanently, and play in the new account.
Just tried this and it was working there as well.
Update: I have no clue how this happened, but I can now log in on the launcher and in-game on my main Windows account. However, I get the "A serious error has occurred while loading [world name]. It is strongly recommended that you restart the application." when I try to load any world (including Sunset Valley).
