javascript - Firebase custom claim how to set?

Question

I'm struggling with firebase custom claims.

I have tested a lot of approaches nothing works. Obviously, I miss something important in the concept itself.

So I'm back to the root. This script from the google example should apply customs rule on a newly created user

exports.processSignUp = functions.auth.user().onCreate(event => {
  const user = event.data; // The Firebase user.
  const customClaims = {
      param: true,
      accessLevel: 9
    };
  // Set custom user claims on this newly created user.
  return admin.auth().setCustomUserClaims(user.uid, customClaims)   

});

Then on a client, I check the result with

firebase.auth().currentUser.getIdTokenResult()
                .then((idTokenResult) => {
                    // Confirm the user is an Admin.
                    console.log(idTokenResult.claims)
                    if (!!idTokenResult.claims.param) {
                    // Show admin UI.
                    console.log("param")
                    } else {
                    // Show regular user UI.
                    console.log("no param")
                    }
                })
                .catch((error) => {
                    console.log(error);
                });

Everything just a raw copy-paste still doesn't work. I've tested both from the local machine(there could be troubles with cors?) and deployed

Answer 1

Waitting for answers