Пакетные запросы Google Indexing API в PHP - 404 Ответ не найден

Question

Я делаю плагин API индексации Google для веб-сайта вакансий (WordPress на AWS CloudFront). Я использую google-api-php-client и google-api-php-client-services.

    require_once plugin_dir_path( __FILE__ ).'/vendor/autoload.php';

    $client = new Google_Client();
    $client->setAuthConfig(plugin_dir_path( __FILE__ ).'/config/MY_API_KEY.json');
    // Setting Scope
    $client->addScope("https://www.googleapis.com/auth/indexing");
    // Use batch
    $client->setUseBatch(true);

    $batch = new Google_Http_Batch($client,false,'https://indexing.googleapis.com');
    // example url
    $arr_url = array(
        "https://example.com/job_option/job_op-title-job/",
        "https://example.com/job_option/job_op-44/",
        "https://example.com/job_option/job_op-title-job/job_op-31/",
    );
    foreach ($arr_url as $url) {
        $postBody = new Google_Service_Indexing_UrlNotification();
        $postBody->setType('URL_UPDATED');//regist.update
        $postBody->setUrl($url);
        $service = new Google_Service_Indexing($client);
        $request = $service->urlNotifications->publish($postBody);
        $batch->add($request);
    }

$results = $batch->execute();

При вызове API выдается ответ "404 - Not Found". Это ответ var_dump

array (size=1)
  'response-155592893' => 
    object(Google_Service_Exception)[833]
      protected 'errors' => null
      protected 'message' => string 'Not Found' (length=9)
      private 'string' (Exception) => string '' (length=0)
      protected 'code' => int 404
      protected 'file' => string '/var/www/html/wp-content/plugins/google-indexing-api-tool/vendor/google/apiclient/src/Google/Http/REST.php' (length=106)
      protected 'line' => int 118
      private 'trace' (Exception) => 
        array (size=8)
          0 => 
            array (size=6)
              ...
          1 => 
            array (size=6)
              ...
          2 => 
            array (size=6)
              ...
          3 => 
            array (size=6)
              ...
          4 => 
            array (size=6)
              ...
          5 => 
            array (size=6)
              ...
          6 => 
            array (size=6)
              ...
          7 => 
            array (size=4)
              ...
      private 'previous' (Exception) => null
      public 'xdebug_message' => string '<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Google_Service_Exception: Not Found in /var/www/html/wp-content/plugins/google-indexing-api-tool/vendor/google/apiclient/src/Google/Http/REST.php on line <i>118</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'... (length=3607)

Я правильно создал учетную запись службы, но не могу повторить успех. Есть идеи, что на самом деле означает эта ошибка?

Заранее спасибо.