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Darwinianevolution said:
Thechalkblock said:

First, update your switch to version 4.0

Next, you need the Wii U GC controller USB adapter that was originally released for Smash 4.

Connect your GC controller to that.

Finally, press the L and R buttons. Your Switch will treat the GC controller as a USB controller.

I tried that. Didn't detect them, but my Wii does.

you might need to go to the “add controller” screen. when i first got mine to connect that’s where i did it.