Firestick with Apple tv

If you are signed in to the Apple TV app and have the Apple TV+ subscription, then any following episodes would show in the ‘Up Next’ row.

If you are not subscribed yet, then only select first episodes of Apple TV+ shows are available.

When signed in and subscribed, the full episode lists are available from the Details page for any of the shows. Select a show, anywhere but Up Next, to go to the Details page. Find the row of episodes below the ‘hero’ image. The list is scrollable horizontally.

Unfortunately, the Apple TV app on Fire TV doesn’t currently support in-app financial transactions. This means that any subscribing, buying, or renting, will have to be done on a different supported device (e.g. iPhone, web). Once subscribed, the subscription content is available on any of your devices, when signed in to the Apple TV app with the matching Apple ID account, including on Fire TV.

[2.] 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.

There are series which will offer a premiere episode available to view without a subscription. If you aren't able to go forward check your account to ensure you have an active subscription.