Multistreaming

Anybody know how to set up multistreaming?

I use streamlabs, I have my tiktok account connected and have the correct permissions to go live on tiktok. Yet I cannot find my tiktok streamkey.

I've followed every single tutorial, searched on tiktok everywhere, tiktok live, tiktok studio yet I cannot find it anywhere.

I see tiktokers live and they're streaming their pc/consol game but I cannot figure it out for the life of me.

Any advice, or a up to date tutorial that works would be awesome. Thanks!