how do i get my game and party audio on to my stream?

Hello Harry,my name is Oskayra, I will be happy to help you in any way possible.

I'm so sorry for what you're going through, make sure your cell phone or tablet is connected to the same Wi-Fi network as the Chromecast Audio or speaker with Chromecast built-in.
Open the Google Home app.
Press and hold the card on your device.
Press Cast Audio. Stream audio.

Source:https://support.google.com/chromecast/answer/6279392?hl=es-419

Note: This is a non-Microsoft website. The page appears to provide accurate and secure information. Beware of ads on the site that may advertise products frequently classified as PUPs (Potentially Unwanted Products). Thoroughly research any product advertised on the site before deciding to download and install it.

I hope the information is helpful to you, if not, let me know that I will be happy to continue helping you, good luck and happy day.

Sincerely,
Oskaira.

Im also having this issue. I did figure out how to get my steelseries 9x to play party audio and my mic audio. I had to allow game bar access to my mic. My problem now is the game audio doesnt come through the stream.

When I stream over the screen from my Xbox, I can hear the game audio, just not party audio.

Thank you for your assistance.

We solved half of my problems. My audio is now streaming to twitch. However, game chat is not. Last week on I was able to stream my mics audio AND my IN GAME chat audio to twitch directly from my Xbox series S, meaning my PC and Playstation party mates audio was making it into my stream.

That is not happening now. Slightly less frustrating but still quite.

Hi, my name is Fernando and I am an independent consultant for Microsoft products.

Everyone in the party who is not streaming needs to give permission for their audio to be used for the broadcast.

Press the Xbox button to open the guide. At the top of the Party chat options check the box labeled “Include my audio”.

PS: Most games do not allow the in-game voice chat to be broadcast. You’ll need to do some google searching or a quick test stream to see if the game you want to live stream is compatible with this method.