I've got the same problem here.
1 of my friends got the email with the code just fine.
My other friend didn't get any email, even though it says he is now invited.
Hope it just has a delay but I'm starting to worry as it has been nearly 8 hours
Same issue here.
Invited a friend to the beta, but he didnt get a e-mail yet. No confirmation email or a email with the code.
Any luck with you guys, or is it best to contact support?