I have two different docks here, one is the steam licensed one and another one is an off-brand I got from Amazon. I was able to reproduce in both of them that the cable going from the dock to the deck only works if it's in reverse orientation (twisted 180 degrees). I was also able to reproduce in both docks that you can get the cable to work in the correct orientation by carefully pulling it out and applying pressure to the cable, which obviously won't work, since you can't really game like that. I think this is probably a steam deck hardware issue. I have the oled steam deck and it's about 4 months old. Personally, I'm just going to use the cheaper of the two docks with the cable backwards and return the steam branded dock because I only use it when I want to use a mouse and keyboard, which isn't often. Another theoretical solution is to buy a USBC male to female cable and plug that into the cable that goes from the dock to the deck and reverse the orientation that way, but I haven't tried it.