How to add MailChimp subscriber tags?

I’ve also tried the following

add_filter('mc4wp_integration_subscriber_data', function (MC4WP_MailChimp_Subscriber $subscriber, $form_id) {
    if ($form_id == 250328) {
        $subscriber->tags[] = 'Tag 1';
    } else if ($form_id == 250329) {
        $subscriber->tags[] = 'Tag 2';
    }
    return $subscriber;
}, 10, 2);

Though this is not resolved, I am marking as such because I think this question belongs on the MC4WP support forum rather than here.