I just tried to get my badge, and I'm getting a message that says my GM Code Disabled. (GM Codes are for people that ran a bunch of games the previous year). I used the code from the third message sent by Caroline. Tried replying to her and posting to the FB group. Just trying to cover my bases by adding here.
Seems to work now! I was getting silver anyway, but it's a bummer for GMs that wanted Gold or higher...
I got the GM code disabled error too... I was purchasing a Gold for a friend as well so I did that first. Then I went back and did my badge solo, and it worked. Not sure if you were trying to buy/gift other badges like I was, that may have been the issue.