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.
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).
