I'm having the same issue but haven't found a solution. Have you had any luck?
It has nothing to do with the display or anything. On my account login through a browser it's listed as "installed" but when I open my Roku device it's not with the other apps or even in the streaming store.
lmr4106, what's the model number or hardware ID of your Roku device displayed under Settings->System->About?
lmr4106, sorry, it's not supported on that model.
How to use the Apple TV channel on your Roku® streaming device | Official Roku Support
