I had the same problem. I thought maybe I should enter my yahoo id I log into Flickr with. But its the nickname you use on your account. So load the first page of your Flickr photos. It will say "Nickname's Photos" where 'Nickname' is whatever you chose for your account. Thats what you will have to enter on the Apple TV page.
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Call me crazy, but how come it's not recognizing my Flickr contact name?
I had the same problem. I thought maybe I should enter my yahoo id I log into Flickr with. But its the nickname you use on your account. So load the first page of your Flickr photos. It will say "Nickname's Photos" where 'Nickname' is whatever you chose for your account. Thats what you will have to enter on the Apple TV page.
I'm having the same issue too. Checked my permission settings and everything seems ok.
@Colin
I've tried that too and it still didn't work. I even tried to change my contact name with no luck.
Found the answer. I needed to make my profile visible to Flickr search.