Hi Carol
I won't be much help at the moment but thought it was worth mentioning that we are experiencing the same. It worked intermittently on the 28th Jan around 9am and by 10am it was down completely. I have checked the feed manually to see if it was a Google issue using the address below and it returned the feed just fine.
https://username@domain.com:password@mail.google.com/mail/feed/atom
It would seem there is an OAUTH issue preventing the retrieval of feeds.