Trying to play Apple TV via app on Vizio smart tv, screen is black with sound only
When I attempt to play Apple TV via the app on my Vizio tv, I get a black screen. I'm signed in on the app, and the account works on my iphone and old (circa 2011) Macbook Air. We use an Amazon Firestick for our interface. Apple TV will play the promo video, but when the movie starts it's just a black screen with audio. Any help is greatly appreciated. Thanks
FireTVStick(Gen2),