Apple TV + on old Apple TV
I can't add Apple TV+ app on my old Apple TV device. I assume because it's an old Apple TV Device (running software 6.2.1)
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That is correct. Apple TV+ requires an Apple TV (3rd generation or later). An Apple TV (2nd generation) is not supported (not even through AirPlay).
All the ways to watch Apple TV+ - Apple Support
If you decide to upgrade to a new Apple TV box, then you’ll find many improvements and support for newer features.