Happened to me, too. I had multiple other problems, also.
First, using Iceweasel browser (Linux), it wouldn't acknowledge that I clicked after filling out the form. I switched to Google Chrome, and that part worked, but I was getting a 404 with the confirmation link. I tried clicking on a different link in the email, and that took me to the confirmation page successfully, and it said it went
through. I keep going back to look to see if I show up on the list, but it hasn't happened, at least in the first 15 minutes or so.