Why notifications doesn't show as popup?

I implemented notifications in my app with Firebase. I can send notifications form Firebase to my phone but this notifications doesn't show as pop up, I can only see it if I scroll down from the top of my pohone to show notifications. What am I doing wrong?

Here are the notification chanels

// Default notifications channel
    String defaultChannelID = getString(R.string.notif_channel_default_ID);
    String defaultChannelName = getString(R.string.notif_channel_default_name);
    String defaultChannelDescription = getString(R.string.notif_channel_default_desctription);
    NotificationChannel defaultChannel = new NotificationChannel(defaultChannelID, defaultChannelName, NotificationManager.IMPORTANCE_HIGH);
    defaultChannel.setDescription(defaultChannelDescription);

    // Alarms notifications channel
    String alarmChannelID = getString(R.string.notif_channel_alarms_ID);
    String alarmChannelName = getString(R.string.notif_channel_alarms_name);
    String alarmChannelDescription = getString(R.string.notif_channel_alarms_desctription);
    NotificationChannel alarmChannel = new NotificationChannel(alarmChannelID, alarmChannelName, NotificationManager.IMPORTANCE_HIGH);
    alarmChannel.setDescription(alarmChannelDescription);

    // Create channels
    NotificationManager notificationManager = getSystemService(NotificationManager.class);
    List<NotificationChannel> notificationChannels = Arrays.asList(defaultChannel, alarmChannel);
    notificationManager.createNotificationChannels(notificationChannels);

And here the FCM service

import android.app.NotificationManager;
import android.util.Log;

import androidx.annotation.NonNull;
import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationManagerCompat;

import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    public MyFirebaseMessagingService() {
        
    }

    @Override
    public void onNewToken(@NonNull String s) {
        Log.e("Token", s);
    }

    @Override
    public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {
        Log.e("Notificacion recibida: ", remoteMessage.getData().toString());

        if (remoteMessage.getData().size() > 0) {
            displayNotification(remoteMessage.getNotification().getTitle(), remoteMessage.getNotification().getBody());
        }
    }

    private void displayNotification(String title, String body){
        String CHANNEL_ID = getString(R.string.notif_channel_alarms_ID);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID)
                .setSmallIcon(R.drawable.ic_home)
                .setContentTitle(title)
                .setContentText(body)
                .setPriority(NotificationManager.IMPORTANCE_HIGH);

        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
        notificationManager.notify(1, builder.build());
    }
}

In other Stackoverflow posts they said that the problem is that I didn't put the notification inportance to HIGH, but, as you can see I writed that and the notifications isn't showing as pop up.

Thanks for ur help

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