What controller are you using with the Deck?
My pick after searching around is the 8BitDo Ultimate C (link) which is the cheaper version of the ultimate with no dock. So far, it’s been working well for me. I just had to restart the Deck the first time after the pairing, since then, it recognize the device all the time.
Post your model below
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I wish I could see my order history to see which 8bitdo I had, but mine did not work with the steamdeck out of the box. It was a wired controller though.