GCM - "Push.appCollection" is empty

Hi!
I have tried to connect my app using the basic guide but still ends up with "Push.appCollection" is empty...

I have created an app in Developer Console.
I have enabled Google Cloud Messaging for Android.
In my config.push.json I have:

{
  "gcm": {
    "apiKey": "AIzaSyCD4fDb2OZPzvRQxjWxxQ_XXXXXXXXX",
    "projectNumber": 150189635563
  },
  "production": false,
  "sound": true,
   "alert": true,
  "vibrate": true
}

In my client/client.js I have:

Push.addListener('token', function(token) {
  console.log('Token: ' + JSON.stringify(token));
  alert('Token: ' + JSON.stringify(token));
});
console.log('Push.id(): ' + Push.id());

In my server/pushServer.js I have:

Push.allow({
  send: function(userId, notification) {
    return true; // Allow all users to send
  }
});
Push.debug = true;

And in client/details.js I call the Push.send like so:

function sendPush(pushObject){
    console.log('Pushing: ' + JSON.stringify(pushObject));
    Push.send({
        from: pushObject.from,
        title: pushObject.title,
        text: pushObject.text,
    query: {}
    });
}

And the console outputs:

=> App running at: http://localhost:3000/
I20150408-13:11:24.084(2)? Push.Configure { gcm: { apiKey: 'AIzaSyCD4fDb2OZPzvRQxjWxxQ_XXXXXXXXX' },
I20150408-13:11:24.086(2)?   production: false,
I20150408-13:11:24.086(2)?   sound: true,
I20150408-13:11:24.086(2)?   alert: true,
I20150408-13:11:24.086(2)?   vibrate: true }
I20150408-13:11:24.086(2)? GCM configured
I20150408-13:11:44.735(2) (android:http://meteor.local/client/client.js:5) Push.id(): tANjKGjGT67XDL28M
I20150408-13:12:53.843(2)? Push: Send message "Aktivitet tillagd" via query {}
I20150408-13:12:53.844(2)? Push: Sent message "Aktivitet tillagd" to 0 ios apps 0 android apps
I20150408-13:12:53.847(2)? Push, GUIDE: The "Push.appCollection" is empty - No clients have registred on the server yet...

Where XXXXXXXXX is just for posting this issue.

Could you guide me in the right direction?
I have also tried uploading the app to heroku, but with the same result.
/Pelle

Review config.push.json and the registration flow referenced by client/client.js, then compare its output with server/pushServer.js and the Push.send call in client/details.js. Reproduce the empty Push.appCollection result and use the existing debug output to identify where registration stops; done means a client appears in the collection and Push.send reports a recipient.