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I am getting this message on my tv
Apple TV 4K, tvOS 15
Which app were you using when this message appeared?
If you remember what you were doing with the Apple TV box exactly, then detailing that would help.
Apple TV 4K, tvOS 15
Users are advised to keep their devices up-to-date, for best support, fixes, features, and stability. We’re on tvOS 16.5 now.
About Apple TV 4K and Apple TV HD software updates - Apple Support