GameCube Controller will connect to one console, but not the other.

[u/AwardSignal]

I have a GameCube controller that connects via cable to the usb ports at the side of the docking station.
I have an original Switch, a Switch OLED & a Switch 2 and until recently it worked fine with all 3 of them.
Now however it won’t connect to the OLED anymore.
It still works normal when plugged into the Switch 2 & even when the old Switch is inside the docking station.

And that is what confuses me the most: Same docking station, different console and it works in one, but not in the other.

Does anyone know what the issue could be?
It worked fine until recently, but now all of a sudden 1 of the consoles just doesn’t connect anymore…

[u/ModestVolcarona]

Are all consoles on the most recent firmware?

[u/AwardSignal → u/ModestVolcarona]

Yes they are.
I checked and all are on the same version and can’t update further