title: Google FCM Server: 200 but no notification sent to phone
body: <p>I am working via Postman to send a FCM push notification to my phone that already has the app installed. I have push notifications enabled, the app is on the background, and I have a valid (confirmed) Firebase push token. </p>
  
  <p>I'm POSTing to <a href="https://fcm.googleapis.com/fcm/send" rel="nofollow">https://fcm.googleapis.com/fcm/send</a> with the headers (Authorization: key=APP_SERVER_KEY, Content-Type: application/json), and my body looks like:</p>
  
  <pre><code>{ "notification": {
  "title": "Portugal vs. Denmark",
  "text": "5 to 1"
  },
   "to": MY_PUSH_TOKEN
  }
  </code></pre>
  
  <p>I'm getting the following 200 OK response with body:</p>
  
  <pre><code>{
   "multicast_id": MULTICAST_ID,
   "success": 1,
   "failure": 0,
   "canonical_ids": 0,
   "results": [{
    "message_id": "0:MESSAGE_ID"
   }]
  }
  </code></pre>
  
  <p>everything looks fine, but I'm not getting a notification on my phone? How can I troubleshoot this, does anyone know what I'm missing? </p>