F rom the YT TC Blog: External annotations to Blogspot blogs If your YouTube channel is linked to a Google+ Page, you may find it tricky to set up external annotations your Blogger blog or additional websites. In my experience, this isn't limited to just Blogger or blogspot blogs, it's an issue with associating any website with your YouTube channel after you've linked it to a Google+ Page. The trick is adding the special @pages.plusgoogle.com username for your Google+ Page as an owner of your blog in Webmaster tools. Once you've done that, your blog will automatically be associated with your Google+ Page-linked YouTube channel. See YouTube TC Andrew Bossom's post that shows you step-by-step how to associate your Google+ Page-linked YouTube channel with your Blogger blog . Related information: YouTube Help: Associated Website Annotations Webmaster Tools: Remove or Add Owner
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