Can you use any headset at Fortnite on the switch? So also old Apple headphones? Or any other in-ear headphones with a microphone? I tried older Apple headphones (they still work fine), but I couldn't be heard in the game.
I don't think the jack plug on the switch supports microphones, it's only for headphones. You will likely need to connect a microphone via USB.
Hm, I just checked the internet again, with games like Fortnite or Overwatch you only need to plug in the jack and then it should work… Maybe I had something wrong in the Fortnite settings.