From @beaulebens' tweet: "Awesome. The @ydn application registration system (domain verification part) is broken. Sarcasm intended. Can haz fix plz?"
Please post more detail as a reply to this thread. Thx
Got it working -- turns out it was actually just a sub-par error message. I didn't have the image that I'd specified as the favicon for my app uploaded yet, so that was causing the verification process to fail. The error didn't mention that though, which would have allowed me to fix it immediately :)