Ugh, you’re right, Way to undermine my own point! There are no official third party wireless controllers.
8BitDo do make licensed controllers that work with Xbox though - for example: https://www.8bitdo.com/pro2-wired-controller-for-xbox/ and https://www.xbox.com/en-US/accessories/controllers/ultimate-wired-controller-for-xbox
[Edit: and there are a bunch of wired third party controllers on Microsoft’s store from other manufacturers: https://www.xbox.com/en-US/accessories?xr=shellnav]
8bitdo (and the other major 3rd party controller makers) have a license. Their controllers are even advertised on Microsoft’s site - e.g. https://www.xbox.com/en-US/accessories/mobile-gaming/sn30-pro
[Edit: @ArugulaZ@kbin.social points out correctly that this controller does not with with Xbox - it’s for mobile. Oops. There are some that do though - see later replies!]
Do you still have to buy some tier of gamepass to be able to play multiplayer games that you own online?