Twitch party audio

If you are live streaming on Twitch you must use the twitch settings. When you stream on Twitch in a party everyone in that party must “include audio” for it to be heard on stream.

Launch The Twitch App - broadcast - broadcast settings - Mic Audio (Checked off) - Include my party audio.

Well if he's streaming on twitch you need to be in a party with your friend. Once you are... open up the party where it shows who's in the party and etc.. there should be an option where it says "Include my audio" Click it and your audio should be joined in with the stream.

Hello There ! would you please check this link Troubleshoot audio problems in parties on Xbox | Xbox Support for further help regarding this issue.

When you stream through Xbox there is a setting in the twitch app to include party chat. But the party members have to allow their audio to be used. If you have “Party Chat” muted on the broadcast screen (it's in between “Microphone” and “Game”), or won't have the option to include audio.