I play Fortnite and I always have my mic on. My friends hear me but I can't hear them.
So if you are still inexperienced, first check if you have the voice chat in the settings on. If you hear them then make sure the push to talk is off. Otherwise they won't hear you. But it can also be that if you only pause the software and then the voice chat no longer works. The Buck has been around for a long time. So keep trying to end the game completely and then go back inside.
Hope I could help, Regards Oscar.
Yes, follow the steps, otherwise the colleagues on the PS4 may have to restart Fortnite.