title: Azure Graph API: authorize application on multiple tenants
body: <p>I am trying to create an application to browse my contacts directory on Exchange.<br>
  I have set up everything and I am able request the authorization from my app.<br>
  I can present the modal view, enter the login information, retrieve the token, but when I try to authorize the app with the same account I have created it I get this message:  </p>
  
  <pre><code>The client &lt;my app id&gt; and resource &lt;my app URI&gt; identify the same application.
  </code></pre>
  
  <p>If I try to authorize another account, I receive this message instead:</p>
  
  <pre><code>User account &lt;an email&gt; from external identity provider &lt;a url&gt; is not
  supported for application &lt;my app id&gt;  
  </code></pre>
  
  <p>If I try to login on the <a href="https://graphexplorer.cloudapp.net/" rel="nofollow">Graph Explorer Console</a> or on the <a href="https://oauthplay.azurewebsites.net" rel="nofollow">Office 365 OAuth Sandbox</a>, they work fine with the second address, but not with the first one.</p>
  
  <p>I am really confuse. I feel like I have mess up some configuration option, but I don't really understand which one.  </p>