Why is this marked as solved? It is not solved.
Watch now often looses track of the fact I own a television series and I am forced instead to go to my library and look through the entire list of episodes to find the next one. This occurs across the macOS app, the iOS app, and the app on my Roku.
I've logged out and logged back in and that doesn't help. It is not that I'm not logged into the incorrect account. I watch one or two episodes through watch now and then immediately after that, instead of letting me watch the next one the app only offers to let me purchase the following episode. And I can go directly from there to my library and watch the next episode without purchasing it.
I do not own an appleTV, but I'm hesitant to purchase one if this is the sort of software quality I'd be forced to put up with.