Android Auto Simulator (DHU) Not Receiving Notifications from My App

I am trying to experiment with android auto and have developed a small app that generates a notification on button click. I receive the notification on my phone but not on the android auto simulator. I am aware of MessagingStyle being used now instead of UnreadConversations, however I can't find a proper source of code example using it.

showNotification() method in MainActivity.java

private void showNotification(Context context) {
    Person user = new Person.Builder()
            .setName("Reminder")
            .build();

    NotificationCompat.MessagingStyle messagingStyle = new NotificationCompat.MessagingStyle(user)
            .setConversationTitle("Reminder!")
            .addMessage("Do you want to continue??", System.currentTimeMillis(), user);

    // Yes Action (Reply)
    Intent yesIntent = new Intent(context, MessagingService.class);
    yesIntent.setAction(MessagingService.ACTION_REPLY);
    PendingIntent yesPendingIntent = PendingIntent.getService(
            context,
            0,
            yesIntent,
            PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_MUTABLE
    );

    NotificationCompat.Action yesAction =
            new NotificationCompat.Action.Builder(android.R.drawable.ic_menu_send, "Yes", yesPendingIntent)
                    .setSemanticAction(NotificationCompat.Action.SEMANTIC_ACTION_REPLY)
                    .build();

    // No Action (Mark as Read)
    Intent noIntent = new Intent(context, MessagingService.class);
    noIntent.setAction(MessagingService.ACTION_MARK_AS_READ);
    PendingIntent noPendingIntent = PendingIntent.getService(
            context,
            1,
            noIntent,
            PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE
    );

    NotificationCompat.Action noAction =
            new NotificationCompat.Action.Builder(android.R.drawable.ic_menu_close_clear_cancel, "No", noPendingIntent)
                    .setSemanticAction(NotificationCompat.Action.SEMANTIC_ACTION_MARK_AS_READ)
                    .build();

    NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
            .setContentTitle("Reminder")
            .setContentText("Do you want to continue?")
            .setSmallIcon(android.R.drawable.ic_dialog_info)
            .setPriority(NotificationCompat.PRIORITY_HIGH)
            .setCategory(NotificationCompat.CATEGORY_MESSAGE)
            .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
            .setStyle(messagingStyle)
            .addAction(yesAction)
            .addAction(noAction)
            .extend(new NotificationCompat.CarExtender());

    NotificationManager notificationManager =
            (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(NOTIFICATION_ID, builder.build());
}

MessagingService.java

public class MessagingService extends Service {
public static final String ACTION_REPLY = "com.example.REPLY";
public static final String ACTION_MARK_AS_READ = "com.example.MARK_AS_READ";

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    handleIntent(intent);
    return START_NOT_STICKY;
}

private void handleIntent(Intent intent) {
    if (intent == null) return;

    String action = intent.getAction();
    if (ACTION_REPLY.equals(action)) {
        handleReplyAction();
    } else if (ACTION_MARK_AS_READ.equals(action)) {
        handleMarkAsReadAction();
    }

    stopSelf();
}

private void handleReplyAction() {
    // Automatically set the reply to "Yes"
    String replyMessage = "Yes";
    Log.d("MessagingService", "Auto reply sent: " + replyMessage);

    // Send the "Yes" response back to MainActivity
    Intent mainActivityIntent = new Intent(this, com.example.notificationapp.MainActivity.class);
    mainActivityIntent.putExtra("response", replyMessage);
    mainActivityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
    startActivity(mainActivityIntent);

    // Cancel the notification
    cancelNotification();
}

private void handleMarkAsReadAction() {
    Log.d("MessagingService", "Notification marked as read");
    cancelNotification();
}

private void cancelNotification() {
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.cancel(com.example.notificationapp.MainActivity.NOTIFICATION_ID);
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}}

I have implemented the above so far. I want the notification generated here to be sent to android auto simulator (DHU) as well. I would really appreciate some help. If you need any other code snippets please do let me know. Thank you in advance! :)

The below worked for me. I still have an issue with sending replies back to the app but that's another problem.

public void showNotification(Context context) {
        Person user = new Person.Builder()
                .setName("Reminder")
                .setKey("reminder_system")
                .setImportant(true)
                .build();

        NotificationCompat.MessagingStyle messagingStyle = new NotificationCompat.MessagingStyle(user)
                .setConversationTitle("Reminder!")
                .addMessage("Do you want to continue??", System.currentTimeMillis(), user);

        Intent replyIntent = new Intent(context, MessagingService.class);
        replyIntent.setAction(ACTION_REPLY);

        PendingIntent replyPendingIntent = PendingIntent.getService(
                context,
                0,  
                replyIntent,
                PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_MUTABLE
        );

        RemoteInput remoteInput = new RemoteInput.Builder(REMOTE_INPUT_RESULT_KEY).build();

        NotificationCompat.Action replyAction =
                new NotificationCompat.Action.Builder(
                        android.R.drawable.ic_menu_send,
                        "Reply",
                        replyPendingIntent)
                        .setSemanticAction(NotificationCompat.Action.SEMANTIC_ACTION_REPLY)
                        .setShowsUserInterface(false)
                        .addRemoteInput(remoteInput)
                        .build();

        NotificationCompat.Action markAsReadAction =
                new NotificationCompat.Action.Builder(
                        android.R.drawable.ic_menu_close_clear_cancel,
                        "Mark As Read",
                        replyPendingIntent)
                        .setSemanticAction(NotificationCompat.Action.SEMANTIC_ACTION_MARK_AS_READ)
                        .setShowsUserInterface(false)
                        .build();


        Intent noIntent = new Intent(context, MessagingService.class);
        noIntent.setAction(ACTION_NO);

        PendingIntent noPendingIntent = PendingIntent.getService(
                context,
                2,  
                noIntent,
                PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE
        );

        NotificationCompat.Action noAction =
                new NotificationCompat.Action.Builder(android.R.drawable.ic_menu_close_clear_cancel, "No", noPendingIntent)
                        .build();

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, MainActivity.CHANNEL_ID)
                .setSmallIcon(android.R.drawable.ic_dialog_info)
                .setPriority(NotificationCompat.PRIORITY_HIGH)
                .setCategory(NotificationCompat.CATEGORY_MESSAGE)
                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
                .setStyle(messagingStyle)
                .addAction(replyAction)
                .addAction(markAsReadAction)
                .setShortcutId("reminder_conv");

        NotificationManager notificationManager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

        notificationManager.notify(notificationId, builder.build());
        Log.d("MessagingService", "Notification sent with ID: " + notificationId);

        notificationId++;
    }