Having the same issue Ohnodesign. Like I said, I contacted devprograms@apple.com earlier and I got a response:
We're following up on your Apple Developer Program enrollment application.
After reviewing your enrollment, we were unable to verify your company information using the DUNS Number provided.
The number is either invalid or was issued by Dun & Bradstreet within the last 2 business days and is not yet visible to Apple.
So it seems my D-U-N-S number isn't active yet, while I got a "Request completed" email from D-U-N-S. Though, I reread the email from D-U-N-S, and it says "You may start using your number in 14 days." while I got that mail 7 days ago.
Maybe that is only in my case though, do you guys have the same?