WooCommerce - Send "New User Registration" email to admins when new customer is created.

plugin.php

<?php

/**
 * Send "New User Registration" email to admins when new customer is created on WooCommerce.
 * 
 * @param int $id New customer ID.
 */
function my_wc_customer_created_notification( $id ) {
	wp_new_user_notification( $id, null, 'admin' );
}

add_action( 'woocommerce_created_customer', 'my_wc_customer_created_notification' );

add_action( 'woocommerce_created_customer', 'woocommerce_created_customer_admin_notification' );
function woocommerce_created_customer_admin_notification( $customer_id ) {
wp_send_new_user_notifications( $customer_id, 'admin' );
}