Webmasters at Google Groups are reporting that some verified sites’ sitemap URLs are not being accepted by Google Webmaster Tools. The error some webmasters are receiving is: “URL not allowed – This url is not allowed for a Sitemap at this location.”

Susan Moskwa of the Google Webmaster Central team says that this is a problem that exists for those who have numerous domains in their accounts. The alternative way is to specify the Sitemap through robots.txt. She writes:

The robots.txt sitemap protocol is explained in this Google Webmaster Help document. Simply add the following line to your robots.txt file:

Sitemap: [path to sitemap]

Forum discussion continues at Google Groups.