Hi,
Since this is a Microsoft UWP application, Steam input won't work. However, there's an alternative: you can use Apollo (a fork of Sunshine) with Moonlight on a local network. If you're using the internet, Parsec might be the best option; these options are free.
It will recognize any controller, so you won't have this problem with Xinput. The configuration is relatively simple, and it responds better compared to Steam. I can instruct you if you wish.
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Thanks