title: Google Analytics User ID view empty
body: <p>I have 2 websites running on 2 separate servers.
  The "public" one is www.projacked.com
  The "members only" one is global.projacked.com</p>
  
  <p>I enabled cross domain tracking using the linker plugin.</p>
  
  <p>In the internal page I have the following (it's twig on Symfony):</p>
  
  <pre><code>    ga('create', 'UA-XXXXXXXX-X', 'auto', {allowLinker: true});
      ga('send', 'pageview');
  
      {% if app.user is not null %}
          ga('set', 'userId', '{{ app.user.id ~ '-' ~ app.user.username }}'); 
      {% endif %}
  
      // Loads the Linker plugin
      ga('require', 'linker');
  
      // Instructs the Linker plugin to automatically add linker parameters
      // to all links and forms pointing to the domain "projacked.com".
      ga('linker:autoLink', ['projacked.com'], false, true);
  </code></pre>
  
  <p>As an example of how the line that sets the user id gets rendered by the template we have:</p>
  
  <pre><code>ga('set', 'userId', '1201056-justintrudeau');
  </code></pre>
  
  <p>This line does not report any error in javascript, and I tested that it gets called.
  I created a separate view for this. I tried as website to track either www.projacked.com or global.projacked.com. I've enabled user id for this view. In any case I cannot see any user on this view.</p>
  
  <p>This is the configuration for the view:
  <a href="https://i.stack.imgur.com/e5g7z.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/e5g7z.png" alt="enter image description here"></a></p>
  
  <p>I've checked that the snipped is with the same UA-XXXXXXXX-X (of course my code).
   Questions:</p>
  
  <ul>
  <li><p>shall I use the members-only website in the view, as it's the only one that can set the userID?</p></li>
  <li><p>do I have to make any change in property? There I have only one website (www.projacked.com). Do I have to do anything to make it register stuff also related to the other website (global.projacked.com), apart from adding the same UA-XXXXXXXX-X there too?</p></li>
  <li><p>why on hell I don't see the users on the members-only site?</p></li>
  </ul>
  
  <p>Thank you</p>