Confused notificationchannel' is only supported on: 'android' 26.0 and later.

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C#

Android4x

MAUI

Testing myapp on Android 9 api level 28 pretty sure. but getting this

Warning CA1416 This call site is reachable on: 'Android' 21.0 and later. 'NotificationChannel' is only supported on: 'android' 26.0 and later.

What I have tried:

using Android.App;
using Android.Content;
using Android.OS;
using AndroidX.Core.App;

namespace LatestMobilePrices.Platforms.Android
{
    [Service]
    public class ForegroundServiceDemo : Service
    {
        private string NOTIFICATION_CHANNEL_ID = "1000";
        private int NOTIFICATION_ID = 1;
        private string NOTIFICATION_CHANNEL_NAME = "notification";

        private void startForegroundService()
        {
            var notifcationManager = GetSystemService(Context.NotificationService) as NotificationManager;

            if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
            {
                createNotificationChannel(notifcationManager);
            }

            var notification = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
            notification.SetAutoCancel(false);
            notification.SetOngoing(true);
            notification.SetSmallIcon(Resource.Mipmap.appicon);
            notification.SetContentTitle("ForegroundService");
            notification.SetContentText("Foreground Service is running");
            StartForeground(NOTIFICATION_ID, notification.Build());
        }

        private void createNotificationChannel(NotificationManager notificationMnaManager)
        {
            var channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME,
            NotificationImportance.Low);
            notificationMnaManager.CreateNotificationChannel(channel);
        }

        public override IBinder OnBind(Intent intent)
        {
            return null;
        }


        public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
        {
            startForegroundService();
            return StartCommandResult.NotSticky;
        }
    }
}