Shortcodes & WP Custom Profile Fields

Hi, I created some WP Custom Profile Fields with:

function campos_de_perfil( $user_contact_method ) {
	$user_contact_method['dni'] = __( 'DNI', 'campos_de_perfil' );
	return $user_contact_method;
}
add_filter( 'user_contactmethods', 'campos_de_perfil' );

All works perfectly here and I can enter a value to “dni”.

After that, I want Mailpoet to return that custom value into the newsletter via a shortcode. I have done the shortcode like that:

//MAILPOET CUSTOM SHORTCODES
function mailpoet_shortcodes_custom_filter( $tag_value , $user_id ) {
    
    if ($tag_value === 'dni') {
        // get the wpuser_id of that subscriber
        $model_user = WYSIJA::get('user','model');
        $subscriber_data = (array)$model_user->getOne(array( 'wpuser_id' ) , array( 'user_id' => $user_id));
        
        // get the wp-user data based on the wp-user id
        $wpuser_data = get_userdata( $subscriber_data['wpuser_id'] );
        
        // return the key you want
        $replacement = $wpuser_data->dni;
    }
    
    return $replacement;
}
// filter registration allowing the two parameters $tag_value and $user_id to be passed
add_filter('wysija_shortcodes', 'mailpoet_shortcodes_custom_filter', 10 , 2);

After that, I created a newsletter with the shortcode:
[user:dni] or [dni]

And I’ve sent me a test email and the value doesn’t appear… What I did wrong?

Thanks!