Would it be possible to add steam to Xbox

I believe the TC is trying to add The Windows App version of FH5 to the Steam launcher as a none steam game. This isn't possible.

Unfortunately due to the DRM the Xbox App installed games still use, it's not possible to add these games to your Steam launcher as none steam games.

GoG Galaxy does allow you to add games from any PC launcher, including the games from the Windows Xbox App.

If you want to stream the Xbox App version of FH5 via steam, you should still be able to by this by launching Steam in Big Picture mode and then minimising to the desktop.

On the other hand if your question was about transferring the game from Windows to Steam then that's not possible. If you want to own FH5 on Steam, you'll need to buy the Steam version.

So to get it onto the xbox/windows version would i have to link it somehow?

(I dont have it on steam so im wondering if its possible because i have money on steam)

It would be pretty amazing if you could, hopefully they add a Steam client to the Xbox One at some point so you can use the Xbox One as a Steam Link as well as a full blown console. Maybe with the Epic Game Store coming in and stealing some of Valve's
lunch, they'll be more open to adding Steam compatibility to the Xbox.

Your Steam app. You have to add them like any Steam friend and vice versa

There is no integration between Steam and Xbox backends for such a transfer.

If the code was for Xbox or the Xbox app on PC, unfortunately, it would not have been possible to redeem it on Steam.

Steam is a different launcher seperate from Xbox services and requires their own keys similar to Epic Games and Rockstar and their respected launchers.

I wish there was better news but this cant be resolved the way you wish