Stream from Xbox and include Playstation players chat?

Does anyone know why only my voice is heard on Twitch stream? I know how to set up Party Chat with other xbox players, but it is not an option for friends I stream with who are on Playstation or PC. We hear each other in Game Chat, but there is no direction for including them on stream. I've been looking for awhile for an answer and everything I find is old and based on when streaming to Twitch was through the App.

***Moved from Gaming and Xbox/Games and gaming/Xbox Series X|S and Xbox One***

:)