Some of you might be getting 404 errors after transferring your FeedBurner account to a Google domain. I was having the same trouble with my own feed, though I was certain I had followed all the steps correctly. I remembered experiencing similar trouble with our domain name which was purchased through Blogger. Blogger was not forwarding to our domain but after toggling the domain forwarding a few times it finally stabilized.

I did the same with MyBrand by deactivating it. When MyBrand was reactivated the 404 errors went away. I only had to do this once! It's stupid but I guess when it comes to Google you have to jiggle the handle sometimes. Hope that helps.