Hey there, sorry I don't have good news.

It came to my attention that the way connection worked wasn't as secure as it should have been, so the Twitch integration will be disabled for the time being. I'm unsure when this can be fixed, because it seems with these new Unity changes, the updated hub has difficulty launching a unity version that old. If you try to connect, it claims it connected but will not work.
I'm very sorry this had to happen, it sucks to have to remove a feature post-launch, but tis the fate of games that use online features in general.