Do you have any non standard characters in the address? Things like '.', '+', '-', or accented characters . While thay are valid characters in an email address sometimes devs forget this and parse user emails without this in mind.
Are you 100% sure you spelled it correctly? Really. Go check.
Did you make sure to check your spam folder? Or all other folders for that matter. If you have any email rules set one of them may have caught the email by accident.
What email provider are you using? Can you receive any other automated emails from this site? (PM notifications, activity summaries from followed threads etc)
(I'm actually not sure if the launcher and the site use the same mail server so maybe this isn't applicable.