Amazon has made it possible for users of Amazon Fire TV with pendant design to no longer use the official Amazon Fire TV Game Controller. The controller is incompatible with the fire TV after the latest update of 126.96.36.199 third generation device software is used. Scuttlebutt suggests that the Four TV Cube will soon lose support for gamepad.
This feature was not an accident with a new disclaimer at the bottom of the Fire TV Game Controls that says "Not compatible with Fire TV with 4K Ultra HD Pendant Design, Fire TV Edition Smart TVs or Four TV Cube. "It leaves the only device that is compatible with the Fire TV Game Controller as the Fire TV Stick. Four TV Stick is still on sale for $ 25 for Prime subscribers right now.
It's unclear why just Amazon has removed support from the controller from these devices. Reports indicate that if you have a Fire TV 3 running software version 6.2.1
Older devices still support game control including Fire TV 1, Fire TV 2, Fire TV Stick 1. The only current generation device that has official support for the controller is the current generation of Fire TV Stick 2. As for why support is dropped, There is no definitive answer from Amazon. Speculation is that it has to do with complexity by maintaining support for the unlike Wi-Fi Direct connection method that the controller uses. It is unclear whether Amazon has a new version of the controller in the work that will support current devices.