I'm having issues verifying www.5ftshelf.com as an OAuth application. I have tried several times throughout the day and with several different file names. In all cases have verified the file is reachable in both the browser and with a wget. The error message I get when hitting the problem is:
"There was an internal error while an application is being created. Please try again."
If I remove the file I get a different error about not being able to get the file, so clearly the Yahoo servers are seeing the file. As per the instructions the file created is empty but googling around I noticed other people have had their oauth token in the file. This is not possible for me as I haven't been told the token at this point.
I am able to create a desktop app oauth key/secret but cannot use this to make requests from 5ftshelf.com presumably?
I've heard of issues w/ subdomains containing a leading numeric character, so I suspect the problem is not on your side. I'll report your experience to the folks investigating this. The only workaround I can recommend for now is to use a domain or subdomain w/ a leading alpha char, eg example.com or sub.example.com