Where can I find my stream key?

I've tried several YouTube videos and forums from searching Google, but either they're wrong or I'm just lost.

I can go live. I have 5k+ followers. I'm approved for live for 180 days or whatever. No restrictions on my account. I can't find it in the app or in the studio. I want to connect it to my OBS and stream TT and Twitch at the same time.

Thanks!