Hmm was hoping that was the issue, I logged out and back in but the Onboarding still does not show up for me in the normal Twitch Settings, still waiting for it to pop up D:
Edit; Ok so the Extension Developer Onboarding still hasn’t shown up but after relogging, but I am able now to press the create extension button in the devs dashboard and create my extension.
Also it never asked to file in any Tax forms as described in the documentation, so I guess it takes the Taxs filing from Partner / Affiliate which makes it a lot easier to create private personal extensions, and limit redistribute them