Stream on YouTube and Twitch?

I would like to stream on YouTube and Twitch at the same time.

Do you know if and how it works?

Should actually work with Streamlabs obs

Restream.io

Clearly with the appropriate resources

Is actually forbidden to stream on both portals at the same time

Do you have a source

Only if you are an affiliate

OBS

But you can't stream on both platforms if you have a contract with Twitch.