I have a 440x Roku and can not get the apple channel

Why can't I get the apple TV app. On my 440x Roku. I two and paid a lot for them. I should not have to go and buy new ones. I pay for the Apple TV app. I can get it on my Roku tv in my bedroom. So I should get it in all the rooms. The 440X is one of the best Roku players it is HDR 4k