Signing up for closed alpha not working

Specifically, it isn't recognizing my forum account. I'm entering the same email account I use for both steam and the forum, but it says "You are not a forum member. Please register on the forum (click here)." I've also tried anything I could relevant to the topic to no avail. Am I doing anything wrong? By the way, that is the only apparent issue.

Could you PM me, please? It's possible there's a typo in the email address you're using here