No party audio when streaming to Mixer.

One thing to note with mixer is that if you are in an Xbox Live party and streaming each person in the party needs to tick the box to include their audio in the stream.

this feature have been added to Mixer, but not sure about Twitch

Mixer only has a setting to include xbox party chat audio on stream, not game chat audio

Whoever is in the party also needs to ensure they allow party audio to be included, it should be a check box their end.

Are you using the chat mixer to change the balance between party and game chat audio? That function makes a beep when you max out the mixer function to all game or all party chat audio.

Hi, no there is not a native way of doing it. But with some third party software and using a pc from which the chat would have to come from you should be able to achieve this. Alternatively if you stream your gameplay with Mixer and include all party chat.
You can save your streams which will include the audio too. I hope that helps