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/continue cors error

Hi,
I’ve connected a social connection with my clientID and Client Secret from google.
Im trying to redirect new users to a welcome page in order to collect more data about the user using auth0 Rules.

I configured the following rules:

function (user, context, callback) {
  if (context.stats.loginsCount === 1) {
    context.idToken.firstLogin = true;
    context.redirect = {
        url: "http://localhost:3000/welcome"
    };
  }
  callback(null, user, context);
}

function(user, context, callback) {
    if (context.protocol === "redirect-callback") {
        // User was redirected to the /continue endpoint
        const _ = require('lodash');
        const RULE_NAME = 'Check for resumed login';
        user.user_metadata = user.user_metadata || {};
        user.user_metadata = Object.assign(user.user_metadata,
            _.pick(context.request.body, ['role']));

        console.log(`${RULE_NAME}: ${user.user_id}: Updating user profile`);
        auth0.users.updateUserMetadata(user.user_id, user.user_metadata)
            .then(() => callback(null, user, context))
            .catch((err) => {
                console.log(`${RULE_NAME} ERROR:`, err);
                callback(err);
            });

    } else {
        // User is logging in directly
        return callback(null, user, context);
    }
}

In /welcome I extract the state from the redirect uri and POST to /continue with the collected data

await fetch(redirectTo, {
method: “POST”,
cache: “no-cache”,
headers: {
“Content-Type”: “application/json”,
Origin: “http://localhost:3000
},
body: JSON.stringify({ role })
});

I get cors error from auth0 even though http://localhost:3000 is regsitered in Allowed Web Origins
and Allowed Origins (CORS)

Can someone suggest a solution?