How to get the given_name and family_name as soon as user signs up in the auth0 user Object

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Hi everyone,

I’m currently facing an issue with Auth0 during the signup process using Universal Login with custom fields.

I’ve created a Pre-User Registration Action to validate and store the first and last name from the signup form, like this:


exports.onExecutePreUserRegistration = async (event, api) => {
    if (!event.user.family_name || !event.user.given_name) {
        if (!event.request.body['ulp-first-name'] || event.request.body['ulp-first-name'].trim() === "") {
            api.access.deny("First name (given_name) is required", "Please provide your first name to complete the registration.");
            return;
        }

        if (!event.request.body['ulp-last-name'] || event.request.body['ulp-last-name'].trim() === "") {
            console.log("Last name (family_name) is not provided, proceeding with registration.");
        }

        api.user.setUserMetadata("given_name", event.request.body["ulp-first-name"] || "");
        api.user.setUserMetadata("family_name", event.request.body["ulp-last-name"] || "");
    }
};

The issue is:
:small_blue_diamond: When the user signs up, the given_name and family_name fields are missing in the ID token and user object.
:small_blue_diamond: But if the user logs out and logs back in, those fields are suddenly available.

I’m assuming this is because they’re stored in user_metadata during signup, and not reflected in the token immediately.

My question:

How can I make sure given_name and family_name are included in the ID token the very first time the user signs up (without needing a second login)?

Do I need to create a Post-Login Action to map user_metadata into token claims manually? Or is there a more “Auth0-native” way to do this?

Thanks in advance for any help or recommendations!

Aditya