On Linux/Proton (0.9.7), Azimuth only reads XInput slot 0, so an always-connected generic receiver (DragonRise USB:ID) takes that slot and the Series X pad is ignored at the “Press A” screen. Could the game bind to whichever connected slot presses A first (like on Xbox One) instead of hardcoding slot 0?
Workaround on linux: ENV SDL_GAMECONTROLLER_IGNORE_DEVICES=USB/ID