Channel 1425 is the Game Show Network that, as of last year, is only available from cable TV providers. It is not a separate app. My channel works fine. But, if you are still having a problem, I would suggest that you install the "Xfinity Stream" app on your firestick (if it is not already installed) and see if you can view and hear the channel there. You will probably need to login to your Xfinity account to register the app on the firestick. You can also install the Xfinity Stream app on any device, like a smart phone or tablet.
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