Voice chat is not broadcast?

I have the problem (not so long) that when I stream (Twitch) my teammates are not transmitted. Of course, all settings correspond to the specifications so that it should actually happen.

Which voice chat: Teamspeak, Discord or simply in the game of voice chat?

The in-game voice chat. A few days ago everything was still going. I play on Xbox and my colleagues on Ps4. However, they haven't changed anything on themselves, so that their voice can still be shared.