title: How to Authenticate to Facebook as Page over XMPP
body: <p>I use XMPPFramework on ios.
  I can authenticate to Facebook as user with X-FACEBOOK-PLATFORM, using User Id and User Access Token.
  But I can't authenticate as a Page, using PageId and Page Access Token.</p>
  
  <p>I receive this message about authentication failure:</p>
  
  <pre><code>RECV: &lt;failure xmlns="urn:ietf:params:xml:ns:xmpp-sasl"&gt;&lt;not-authorized/&gt;&lt;/failure&gt;
  </code></pre>