Two Apple TVs. Watch history, to the best of my recollection, has never worked for me. I watch a TV show or a movie on one Apple TV, and the watch status does not sync to the other one. I install Infuse on my Mac, and it has the exact same issue. What I’ve noticed is that if I play a movie and stop in between, that particular status will sync. For example, if I watch 15 minutes of something, the other Apple TV will sync the 15 min mark watch status. But if I finish season 1 episode 5 on one Apple TV, the other Apple TV will show episode 5 as unwatched. Same with movies.
I’ve no idea what is causing this, but this is one of the features of the paid tier, so I would love some help on this.