Why doesn't the microphone work with Fortnite on the switch?

Nobody can hear me in Fortnite but can't be due to my headset because it works on my mobile phone push to talk is also on and on my switch it is so that we tried it with the headset from a friend and there it went anyway no idea what's going on if someone knows what to do please tell me!

Perhaps it is due to your internet, or the firewall, I had the same problem earlier, which could be fixed very quickly.

I would say it may be due to the setting of the switch so it works for me on the switch, PS4 and on all or it is due to the headset otherwise I have no idea.

And how do i fix it?