...did everyone of you (who had pre-joined) get the short email?
Or let's put it the other way - did you pre-join and didn't receive an email? Or did it go into spam?
(no known issues in the system, but just checking to be sure)
(if you joined at the very same second the game opened, then you might have missed it, since the system sends those out only after game is actually open, and if you already joined then it won't spam you unnecessarily)