无法通过Firebase Cloud Messaging发送消息

如何解决无法通过Firebase Cloud Messaging发送消息

我无法通过FCM向主题发送消息

授权：

FirebaSEOptions options = FirebaSEOptions.builder()
    .setCredentials(
         GoogleCredentials.fromStream(FileUtils.systemResourcetoInputStream("google-services.json"))
             .createScoped("https://www.googleapis.com/auth/firebase.messaging")
    )
    .setDatabaseUrl("https://APP_CODE.firebaseio.com")
    .build();
FirebaseApp.initializeApp(options);

发送请求：

Message message = Message.builder()
   .setNotification(Notification.builder().setTitle("title be").setBody("body be").build())
   .putData("data1","value-data1")
   .setTopic("test-topic")
   .build();

// Send a message to the devices subscribed to the provided topic.
String response = FirebaseMessaging.getInstance().send(message);
// Response is a message ID string.
System.out.println("Successfully sent message: " + response);

Firebase的响应包含以下内容：projects/APP_CODE/messages/8356633794602150244，但是没有设备收到此消息。大部分代码取自https://firebase.google.com/docs/cloud-messaging/auth-server和https://firebase.google.com/docs/cloud-messaging/send-message#send-messages-to-topics

有人知道为什么这行不通吗？