Apple TV
My Apple TV does not have the Apple TV + app? What am I doing wrong
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What is your model Apple TV? Identify your Apple TV model - Apple Support
Have you updated the software to the current version? How to update your Apple TV - Apple Support
Apple TV+ doesn’t have its own app. Instead, it is one of the Channels in the Apple TV app on Apple TV (3rd generation or later).
Devices you can use with the Apple TV app and Apple TV+ - Apple Support