title: Google App Invites invitations not being sent
body: <p>As of 11/11/2015 Google App Invites are no longer sending out emails. SMS still works. Has anyone else experienced this? My app code has not changed in the last few weeks so suspected might be something to do with Play Services 8.3 - but that doesn't seem to be the cause.</p>
  
  <p>I have checked:</p>
  
  <ul>
  <li>No special characters in message </li>
  <li>Updated to latest Play Services 8.3</li>
  <li>Included <code>classpath 'com.google.gms:google-services:1.5.0-beta2'</code></li>
  </ul>
  
  <p>InvitiationIds are being generated and no errors are being thrown.</p>
  
  <p>Any suggestions of what else might be causing this?</p>