Unable to locate the Unknown Golf TV app for FireStick
If you cannot find the Unknown Golf TV App in the Amazon App Store, it is likely that your Firestick is running Fire OS 5 or an earlier version.
Unfortunately, Firesticks running Fire OS 5 cannot be upgraded to Fire OS 6. If your device is on Fire OS 5, the only option is to purchase a newer Amazon Firestick that supports Fire OS 6 or later.