Set admin Facebook comment box

Question

I'm tried with some posts here but not work for me!
This is my App setting on Facebook develope (sr, don't have enough reputation):
App Domains : localhost
Site URL: http://localhost:50031/
App Id: 570146336422

Here is my meta in head tag:

<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta property="fb:app_id" content="570146336422" />
<meta property="og:url" content="http://localhost:50031/" />

And this is my code in body tag

 <div id="fb-root"></div>
  <script>
      (function (d, s, id) {
         var js, fjs = d.getElementsByTagName(s)[0];
         if (d.getElementById(id)) return;
         js = d.createElement(s); js.id = id;
         js.src = "//connect.facebook.net/vi_VN/sdk.js#xfbml=1&version=v2.3&appId=570146336422";
         fjs.parentNode.insertBefore(js, fjs);
         }(document, 'script', 'facebook-jssdk'));</script>
 <div class="fb-comments" data-href="http://localhost:50031/" data-numposts="5"></div>

But I can't get Admin role for my page

Answer 1

According CBone's answer comment. The Facebook can't read your meta tag in localhost, but it will be worked correctly in real host over the Internet