title: I get InvalidRegistration while sending notification to Android
body: <p>I'm trying to send notification using php curl to android but I get this:</p>
  
  <pre><code>{"multicast_id":6460600019383907027,"success":0,"failure":1,"canonical_ids":0,"results":[{"error":"InvalidRegistration"}]}
  </code></pre>
  
  <p>Im getting token in android with the below code:</p>
  
  <pre><code>public String getToken() throws IOException {
      return FirebaseInstanceId.getInstance().getToken();
  }
  </code></pre>