We recently purchased a new Apple iPhone 11 and it gave us 1 year free subscription to Apple TV

After downloading the Apple TV+ app on my Samsung tv, I opened the app and clicked on the BET+ channel. It gives me the message, In-app purchases aren't allowed on this device. To watch here, you must have subscribed on an apple device. ok. When I click on ok, it takes me back to the same screen, with the original statements.