automatisierter Email Versand Hook wird nicht erreicht

// in my functions.php
add_action( 'set_user_role', 'new_role_A', 10, 3 );
 
function new_role_A( $user_id, $role, $old_roles ) {
    if($user_id)
        {
            do_action( 'woocommerce_ats_customer_activated', $user_id );
        }
}
 
//###############################################################################
// in the extra "plugin" in custom-wc-email.php
<?php
/**
 * Plugin Name: Custom WooCommerce Email
 */
 
if ( ! defined( 'ABSPATH' ) )
    {
        return;
    }
 
 
/**
 * Class Custom_WC_Email
 */
class Custom_WC_Email
    {
 
        /**
         * Custom_WC_Email constructor.
         */
        public function __construct()
            {
                add_filter( 'woocommerce_email_classes', array( $this, 'register_email' ), 90, 1 );
                define( 'CUSTOM_WC_EMAIL_PATH', plugin_dir_path( __FILE__ ) );
            }
 
        /**
         * @param array $emails
         *
         * @return array
         */
        public function register_email( $emails )
            {       
                require_once 'emails/class-wc-customer-activated.php';
                $emails['WC_Customer_Activated'] = new WC_Customer_Activated();
 
                return $emails;
            }
    }
 
new Custom_WC_Email();
 
 
 
//###############################################################################
// and in the extra "plugin" file in class-wc-customer-activated.php
 
<?php
if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly
}
 
if ( ! class_exists( 'WC_Email' ) ) {
    return;
}
 
/**
 * Class WC_Customer_Activated
 */
class WC_Customer_Activated extends WC_Email {
 
    /**
     * Create an instance of the class.
     *
     * @access public
     * @return void
     */
    function __construct() {
    // Email slug we can use to filter other data.
            error_log("__construct");
        $this->id          = 'wc-customer-activated';
        $this->title       = __( 'Kunde freigeschaltet', 'custom-wc-email' );
        $this->description = __( 'Es wird eine E-Mail an den Kunden gesendet, sobald er freigeschaltet wurde.', 'custom-wc-email' );
    // For admin area to let the user know we are sending this email to customers.
        $this->customer_email = true;
        $this->heading     = __( 'Account freigeschaltet', 'custom-wc-email' );
        $this->subject     = sprintf( _x( '[%s] Account freigeschaltet', 'Standardbetreff für E-Mail die an den Kunden gesendet werden, sobald er freigeschaltet wurde.', 'custom-wc-email' ), '{blogname}' );
 
    // Template paths.
        $this->template_html  = 'emails/wc-customer-activated.php';
        $this->template_plain = 'emails/plain/wc-customer-activated.php';
        $this->template_base  = CUSTOM_WC_EMAIL_PATH . 'templates/';
 
    // Action to which we hook onto to send the email.
        add_action( 'woocommerce_ats_customer_activated', array( $this, 'ats_trigger' ), 10, 1 );
            error_log("__construct AFTER woocommerce_ats_customer_activated");
 
        parent::__construct();
    }
 
 
 
  /**
     * ATS_Trigger Function that will send this email to the customer.
     *
     * @access public
     * @return void
     */
    public function ats_trigger( $user_id ) {
            error_log("TRIGGER START");
 
        $customer = new WC_Customer( $user_id );
        $this->object = $customer;
 
        $this->recipient = $customer->get_email();
 
 
        if ( ! $this->is_enabled() || ! $this->get_recipient() ) {
            return;
        }
 
            error_log("TRIGGER vor this->send");
        $this->send( $this->get_recipient(), $this->get_subject(), $this->get_content(), $this->get_headers(), $this->get_attachments() );
            error_log("TRIGGER NACH this->send");
    }
 
 
  /**
     * Get content html.
     *
     * @access public
     * @return string
     */
    public function get_content_html() {
            error_log("get_content_html this->template_html:".print_r($this->template_html,1));
            error_log("get_content_html this->object:".print_r($this->object,1));
            error_log("get_content_html this->get_heading():".print_r($this->get_heading(),1));
            error_log("get_content_html this->template_base:".print_r($this->template_base,1));
        return wc_get_template_html( $this->template_html, array(
            'customer'         => $this->object,
            'email_heading' => $this->get_heading(),
            'sent_to_admin' => false,
            'plain_text'    => false,
            'email'            => $this
        ), '', $this->template_base );
    }
 
    /**
     * Get content plain.
     *
     * @return string
     */
    public function get_content_plain() {
            error_log("get_content_plain");
        return wc_get_template_html( $this->template_plain, array(
            'customer'         => $this->object,
            'email_heading' => $this->get_heading(),
            'sent_to_admin' => false,
            'plain_text'    => true,
            'email'            => $this
        ), '', $this->template_base );
    }
}