why do i need itunes to watch tv
the apple tv app on my firestick tv won't let me get pass the next screen unless i have itunes
See: Get your Apple ID ready for purchases or downloads on your Apple TV - Apple Support
and for Fire TV, you will need a secondary device for transactions regarding subscriptions or purchases.
On Amazon Fire TV, Android TV, and Sony TV devices, you can't purchase content from the Apple TV app. You can buy, rent, or subscribe on another supported device and then watch in the Apple TV app on your Amazon Fire TV, Android TV, or Sony TV device. [1]
