So I was just able to sync multiple accounts on my PS4 to my twitch account. When I go to one or the other they both come up with the same broadcasting screen with the same stream title. Tested it by switching profiles and starting a stream while viewing my channel. I disconnected my alt account from my alt PS4 profile then broadcasted it and when it prompted me to activate I went on the website, without being logged into my main Twitch account, activated and then logged into my main account an poof, it worked. Hope this helps.
Don't know if it will work with Xbox but I don't see why not.
So I was just able to sync multiple accounts on my PS4 to my twitch account. When I go to one or the other they both come up with the same broadcasting screen with the same stream title. Tested it by switching profiles and starting a stream while viewing my channel. I disconnected my alt account from my alt PS4 profile then broadcasted it and when it prompted me to activate I went on the website, without being logged into my main Twitch account, activated and then logged into my main account an poof, it worked. Hope this helps.
Don't know if it will work with Xbox but I don't see why not.