title: Trying to claim website URL for Facebook Instant Articles, but receive fb:pages error
body: <p><strong>The fb:pages tag on the url doesn't contain this page's id. The url has
  fb:pages tag but they don't have this page's id. Please work with your
  developers / webmaster to add this tag to your website.</strong></p>
  
  <p>On a Wordpress site, using a child theme. I copied the header.php file from the parent and uploaded it to the child theme, and placed the following code within the  tags in the <strong>header.php</strong> file:</p>
  
  <pre><code>&lt;meta property="fb:pages" content="#############" /&gt;
  &lt;meta property="og:type" content="website" /&gt;
  </code></pre>
  
  <p>I have troubleshooted this issue in all the recommended ways, including clearing my browser and Wordpress cache, and still continue to get this error. What am I doing wrong?</p>