4th generation. Device restart didn't help. I managed to fix the problem by signing up for an abc.com account and re-entering/re-authenticating my ABC app. However the abc.com site and my AppleTV ABC app were already syncing my episodes and this only came up when I tried to watch the most recent episode of The Rookie on my AppleTV. I had to do the fix through the internet and it only fixed the problem on the AppleTV app after I started watching the episode on the abc.com site. I'm not even sure at what point the problem resolved as it took several log-ins and at least a couple activations by codes and re-entering of my provider, which was already registered and saved on the internet site. We'll see if it holds when the next episode of The Rookie posts next week. Pretty strange! (Thanks for your interest and assistance, btw.)