I bought a used xbox one x from someone who bought the x series. It was factory reset with latest firmware. I attempted to install Forza Horizon 1 using the game disc (which has zero scratches and is in really good condition), but nothing happens.
I am in the same boat as you @MrShanks. I attempted to install Forza Horizon 1 using the game disc on my Series X and all I get is a Blu Ray disc application but game never even installs. So much for Backwards Compatibility. Luckily I still have my old XB360 so I will still be able to play FMs 1-4 and Horizon 1
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