I’m on the same boat. I can use twitch perfectly except the extension dashboard. I had some extensions installed, but suddenly installed extensions panel became empty, extensions stopped working on my channel and clicking the install button on any extension from the available extensions panel apparently does absolutely nothing.
I have already tried contacting twitch support, but it’s been a month and still no answer.
Also tried resetting the password and clearing the browser cache as general troubleshooting steps, but none worked.
Anything else I can do on my side? Or should I just wait for a fix from Twitch? How much could such a fix take?