Cant create an alarm in Xamerin Android C#

Copied my teacher's simplified code in order to see if the code i wrote was wrong or somthing yet even her's isnt working. Here is it:

private void BtnAlarm_Click(object sender, EventArgs e)
            Intent intentAlarm = new Intent(this, typeof(AlarmReceiver));
            // #2 - Pending intent - > Broadcast
            PendingIntent pendingIntent = PendingIntent.GetBroadcast(Application.Context, 1, intentAlarm, 0);
            // #3 - Set Alarm Manager
            AlarmManager alarmManager = (AlarmManager)GetSystemService(AlarmService);
            SystemClock.ElapsedRealtime() + 30 * 1000, pendingIntent);

The debugger wont run onto this activity:

public class AlarmReceiver : BroadcastReceiver
        public override void OnReceive(Context context, Intent intent)
            Toast.MakeText(context, "Received intent!", ToastLength.Short).Show();

Just to be clear, while running her app the alarm was working.

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