I recall for splatoon 2 you needed like a cable running to your phone and the switch and you needed a specific app for splatoon 2 voice chat.
Is there something like this for overwatch or how would it work?
edit
" Previously, Epic Games’ Fortnite has bucked this trend by allowing players to natively voice chat within the game simply by connecting a headset with an integrated microphone.
Overwatch follows in its footsteps, making use of Blizzard servers to host voice chat for any and everyone playing on Switch. This cuts out the middle man and makes engaging in voice chat a far simple and more refined process, which should hopefully also entice a greater number of players to bust out their microphones and start playing the first-person shooter to the best of their (and also their teammates’) ability."
htt ps://www.gamerevolution.com/guides/607861-overwatch-switch-voice-chat
found this article so shouldn’t need a splitter like splatoon?