Dependency service event - xamarin.forms

Question

I am trying to call the event handler from droid side, however it doesn't get fired. everyone else works however this event doesn't get fired. I am not sure what am I doing wrong. I have my dependency service registered at MainActivity and set dependency in my service.
public partial class MainPage : ContentPage
{
DocumentResults results;
IScanService scanService;
public MainPage()
{
InitializeComponent();
results = new DocumentResults();
BindingContext = new MainPageViewModel();
System.Diagnostics.Debug.WriteLine("test cw");
Console.WriteLine("test cw");
scanService = DependencyService.Get<IScanService>();
scanService.ResultsParsedEvent += (s, ev) => { ResultsParsed(null, ev); };
}
void Button_Clicked(System.Object sender, System.EventArgs e)
{
scanService.ScanService();
if (!String.IsNullOrWhiteSpace(test))
{
scanService.Parsing(test);
}
}
private void ResultsParsed(DocumentResults results,EventArgs e)
{
Console.WriteLine("update ");
testLbl.Text = results.Name;
}
}
My interface
public interface IScanService
{
event EventHandler ResultsParsedEvent;
string ScanService();
void Parsing(string test);
void resultsParsed(DocumentResults results, EventArgs e);
}
Droid implementation
public class RegService : IScanService
{
public event EventHandler ResultsParsedEvent;
DocumentResults results;
public string Test;
public String ScanService()
{
Test = "scan";
return Test;
}
public void Parsing(string test)
{
Test = "parsing";
var results= new DocumentResults();
results.Name = Test;
Thread thread1 = new Thread(() => resultsParsed(results,null));
System.Threading.Thread.Sleep(10);
resultsParsed(results,null);
}
public void resultsParsed(DocumentResults results, EventArgs e)
{
ResultsParsedEvent?.Invoke(results, e);
}
}