I am having problems configuring Amplify API Subscriptions.
I modify the model User from one screen and I don’t receive any event from the subscription, even I print the message ‘Subscription established’
This is the code I execute at initialiazing the app and in the screens which I need to query the changes.

StreamSubscription<GraphQLResponse<User>>? subscription;

void subscribe() {
  final subscriptionRequest = ModelSubscriptions.onCreate(User.classType);
  final Stream<GraphQLResponse<User>> operation = Amplify.API.subscribe(
    subscriptionRequest,
    onEstablished: () => safePrint('Subscription established'),
  );
  subscription = operation.listen(
    (event) {
      safePrint('Subscription event data received: ${event.data}');
    },
    onError: (Object e) => safePrint('Error in subscription stream: $e'),
  );
}

User model. In some tutorials, I watched no implementations were added to the model

type User @model @auth(rules: [{allow: public}]) {
  username: String! @primaryKey
  id: ID!
  device_key: String
  full_name: String
  email: AWSEmail
  tastes: AWSJSON
  creator: Boolean
  wallet: Float
  wallet_creadores: AWSJSON
  address: AWSJSON
}

I try to set up according Amplify Documentation recommends but I couldn’t make it work. I expected that initialiazing the subscription once, it would be enough to listen all the changes for that specific model.