The publisher gives a Fire TV-specific instruction
FOUND’s support page says purchases and subscriptions for rental viewing or paid upgrades on the Fire TV app need to be made through its website. This is more specific than the general statement that the service has a Fire TV app. App availability does not mean every transaction can be completed inside that app, and the absence of an in-app checkout is not automatically an error.
Confirm the title before changing the account
First inspect whether the item is included viewing or a separately offered rental. FOUND explains that some early releases are licensed on a rental-only basis. An ad-free membership and a rental are therefore different access questions. Keep the exact title and account with the transaction so you can later distinguish an unrecognised purchase from an item that was never included in the first place.
Use the same account on the intended viewer
Follow the publisher’s official website route and inspect the actual terms before any purchase. Then use the corresponding account in the Fire TV app. Do not publish a private account email or complete receipt in a general support post. If the rental does not appear, report the transaction reference through the publisher’s support process rather than making repeated purchases to test the screen.
Do not generalise to every platform
The FAQ separately describes account management for website, Apple and Roku purchases. A Fire TV instruction should not be copied into a guide for every television or phone. This article explains the documented route and has not performed a rental, payment or account activation. It does not guarantee availability on every Fire TV model or establish any access through a UKIPTV player.
Questions, answered
Does an ad-free membership remove a separate FOUND rental requirement?
No. Inspect the actual film; the publisher describes rental-only releases.
Should I keep buying again if the Fire TV app does not show the rental?
First check the account and use the publisher’s support route with the original transaction reference.