Ethernet connected Router, TV, and Apple TV; but Apple TV is going wacky
Apple TV 4K is Ethernet connected, as are all devices. Still, because Apple TV 4K displays 'an unexpected error occurred' and fails to display any further screens, I can't use this Apple TV for TV programs, I can't use this Apple TV for my 19 Purchased Movies 'because that screen says 'You haven't purchased any movies.'
Indeed, this Apple TV 4K fails to go to any other screen when I try to browse, except to display a 'not connecting' signal image. Still, when I visit the AppStore on my Mac, installing the Apple TV app fails to work. It could be my old Laptop (mid 2009 MacBook Pro OS X El Capitan 10.11.6
Apple TV 4K, tvOS 14