Video not available - There's a problem loading this video - MSG
I have been having the Exact Same Problem on any movie I try to watch on Apple TV+ App. through my Roku Device. I have a paid Apple TV+ subscription and have been trouble shooting this problem of over a week and have tried "Everything"
I have a High speed / High Bandwidth internet connect "Wired" and the Apple TV+ works fine when logged on and watching through my PC. On my Roku, every other paid subscription works like a champ even through I have noticed that it is starting to take up to 15 to 30 seconds to load a new movie and begin watch (HBO MAX and Netflix). A blank screen will appear for the 15 to 30 seconds and then the movie starts.
BUT when logged into the Apple TV+ App, through my Roku Device, I will see the spinning dots for that 15 to 30 seconds and then BLAM! the "Video not available - There's a problem loading this video" MSG will pop up on the screen and I am dead in the water!!!! This is a real set back because the main reason I re-subscribed to Apple TV+ was the watch "Foundation".
Actually, this problem has been going on for several years and over many other devices so it is most definitely an 80% to 90% APPLE Application coding error. I have also noticed that this is never reported on a Apple devices, only on Non-Apple hardware. So the Coding Error is only a problem with non-Apple devices, so it is probably not a priority for them to fix it.
I'm an old guy who has been around these devices from the very beginning (late 1970's) in the Electronics industry and the old APPLE / Microsoft (and Cloned devices) rivalry seems to still be hanging around complicating cross device compatibility problems (Just like this one)
So either ROKU Engineers will have to break the APPLE video streaming code or we are left with the only solution, one which APPLE Wants us to follow. Go out and buy an Apple device, an Apple TV or iPad etc etc ect.
I would like to hope for the best but I'm not placing any bets on this being fixed any time soon unless Roku get serious and stop blaming internet connectivity problems. Apple will not fix it.
Roku Tech Support "Do you hear me now???"Displayed on the screen