Constant SETUP_AUTHORIZATION_TOKEN 

const SETUP_AUTHORIZATION_TOKEN: u64 = AUTHORIZATION_TOKEN; // 3u64

AUTHORIZATION TOKEN, the Setup Parameter of Section 8.3.2.4.

That section defines the setup-side parameter by reference - “See Section 8.2.1.1” - so it carries the same type number and the same permission to repeat: “The endpoint can specify one or more tokens in CLIENT_SETUP or SERVER_SETUP that the peer can use to authorize MOQT session establishment.”