Arcade on Apple TV
I’ve subscribed to Apple Arcade and everything is fine on iPhone and iPad. None of my 3 Apple TV’s seem to have access to arcade. It’s just to ad screen telling me it will launch soon. I am running software TVs 13.0 (17J5585a)
its not enabled for all users of the tvos Beta software you will likely have to wait for tvOS to be released
if you wish to know more
https://9to5mac.com/2019/09/19/apple-software-later-this-year/