With the myriad of services that Google offers, its a wonder that any of them work together sometimes.
With this shiny new blog, I wanted to submit a google sitemap (using Google's webmaster tools of course). If you follow the directions out there on the interwebs about how to do that, it seems that there are some pitfalls.
I followed the directions to use mysite.com/atom.xml, and even tried mysite.com/rss.xml as my feed, but when I checked back in with Google Webmaster tools, sure enough, all my submitted URLs have errors.
The reason it gave was: "This url is not allowed for a Sitemap at this location. Problem detected on: feedproxy.google.com/~r/etc etc etc. -- Details URL not allowed"
Turns out that certain settings make your blog entries pass through another of Google's services. The problem that the Google Webmaster service has with this is that the URLs (which start with feedproxy.google.com...) are not the same base URL as the blog (which was "mysite.com/etc/etc" before), hence the "URL not allowed" statement. I can't claim another site's content as my own, now can I?
Ok, so here is the fix for people with Blogger accounts. Instead of using people's recommendations of submitting "mysite.com/atom.xml", instead submit "mysite.com/feeds/posts/default?orderby=updated"
Works like a charm, and now my URLs are properly being picked up. Another hack to make Google work with Google. Lovely.