2 headsets on ps4?

We're playing splitscreen fortnite for two. I'm the group leader and the headset goes with me. With the other controller with headset you can't have a say and only hears what I'm doing. What can it be that only one can talk?

the language settings of the second controller indicate that only the group leader can change this but I have already activated the voice chat?

There's only one headset per console… It's clear…

Yes I have 2 consoles

Thought you play splitscreen, what now?

Then why do you play with a split screen?