title: How many topics an app instance can subscribe in FCM?
body: <p>As mentioned in FCM documents, unlimited topic can be created for one Firebase application. But as the <a href="https://firebase.google.com/docs/cloud-messaging/admin/errors" rel="noreferrer">Firebase Admin SDK document</a>: explains an error:</p>
  
  <blockquote>
    <p><strong>messaging/too-many-topics</strong>:- A registration token has been subscribed to the maximum number of topics and cannot be subscribed to any more.</p>
  </blockquote>
  
  <p>I was not able to find this threshold value of maximum number of topics. Can anybody explain, what is the limit? <strong>How many topics an app instance can subscribe to in FCM?</strong></p>