notification custom sound not working with some devices

I have a services in my app Which is used to alert the user when the charger is connected, but the problem is that the custom sound does not work with some devices even though they are all Android 8 version. My code : `

    public void notification(Intent intent) {
 int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS,-1);
   
 boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ;

    Intent enterApp_intent = new Intent(getApplicationContext(),MainActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(),0,enterApp_intent,0);

    Bitmap largeIcon = BitmapFactory.decodeResource(getApplicationContext().getResources(),R.drawable.main_icon);

    NotificationCompat.Builder charging_builder = new 

    NotificationCompat.Builder(getApplicationContext());
    charging_builder.setContentTitle("Title");
    charging_builder.setContentText("Content Text");
    charging_builder.setContentIntent(pendingIntent);
    charging_builder.setLargeIcon(largeIcon);
    charging_builder.setSmallIcon(R.drawable.null_shape);
    charging_builder.setDefaults(NotificationManager.IMPORTANCE_MAX);
    charging_builder.setColor(Color.parseColor("#1fd699"));
    charging_builder.setOngoing(false);

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

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){

        AudioAttributes audioAttributes = new AudioAttributes.Builder()
                .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                .setUsage(AudioAttributes.USAGE_NOTIFICATION)
                .build();

        NotificationChannel charging_notificationChanel = new NotificationChannel("charging_battery","charging battery",
                NotificationManager.IMPORTANCE_DEFAULT);
        charging_notificationChanel.setDescription("Charging notification");
        charging_notificationChanel.setSound(Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE+"://"+getBaseContext().getPackageName()+"/"+
                R.raw.charging_notification),audioAttributes);

        charging_notificationChanel.enableVibration(false);
        charging_notificationChanel.enableLights(true);

        notificationManager.createNotificationChannel(charging_notificationChanel);
        charging_builder.setChannelId("charging_battery");
    }

    if(isCharging){ // charging
        notificationManager.notify(19,charging_builder.build());
    }
}`

The notification is show at all devices but some don't exists a sound? and it's all working with API 26.why that?

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