Apple TV app not working on cellular data
iPhone 12 running on iOS14.6
Apple TV app working fine over WIFI but not when connected to cellular data even if cellular data has more decent download speed
iPhone 12, iOS 14
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Settings﹥Cellular﹥[scroll down] has per-app settings to allow or disallow cellular use, independent of your second screenshot. These settings may help you to not exceed the mobile plan limits unintentionally.
Verify that this is turned on for the TV app, if you want to allow such use.