title: Requested entity was not found when trying to send a push notification using Firebase Cloud Messaging in Firebase Cloud Functions
body: <p>I'm trying to send a multicast notification via FCM from a Firebase Cloud function with the following code:</p>
  
  <pre><code>const message = {
      tokens: recipients,
      notification: {
          title: title,
          body: body
      },
      data: {
          projectPartnerId: projectPartnerId
      }
  };
  return admin.messaging().sendMulticast(message);
  </code></pre>
  
  <p>And none of the push notifications is getting sent. Each response contains an error with the same message: "Requested entity was not found".</p>
  
  <p>I enabled the API in the Google Cloud console (which was not mentioned anywhere in the Firebase documentation but apparently that was necessary). I don't know what else I can do. And all the other questions I could find related to the HTTP API or the legacy API. I'm using the latest version of the Firebase Admin SDK.</p>