title: Error: Requested entity was not found. at FirebaseMessagingError.FirebaseError [as constructor]
body: <p>when do firebase push notification</p>
  <pre><code>firebaseAdmin.messaging().sendMulticast(message)
  </code></pre>
  <p>I get and error</p>
  <pre><code> // Error: Requested entity was not found. at FirebaseMessagingError.FirebaseError [as constructor]
   // code: &quot;messaging/registration-token-not-registered&quot;, message: &quot;Requested entity was not found.&quot;
  </code></pre>