C# Access denied after Contacts.CNContactStore().RequestAccess - cncontactstore

Question

I use VS for Mac version 17.4.2
I would like to read all my own MacOs contacts.
I create a new Cocoa application (Mac -> App -> Xamarin).
I add the necessary parameter in info.plist :
<key>NSContactsUsageDescription</key>
<string>This app requires contacts access to function properly.</string>
I begin by requesting access, and that generates an error (see below).
In System preferences / Security/ Confidentiality, no app has asked access to Contacts.
How can I fix this issue? Thank you.
using AppKit;
using Contacts;
using Foundation;
using System;
namespace Upd2
{
public partial class ViewController : NSViewController
{
private CNContactStore store;
private CNAuthorizationStatus auth;
public ViewController(IntPtr handle) : base(handle)
{
store = new Contacts.CNContactStore();
auth = CNContactStore.GetAuthorizationStatus(CNEntityType.Contacts);
Console.WriteLine(string.Format("\nAuthorizationStatus : {0}", auth.ToString()));
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
// Do any additional setup after loading the view.
if (auth == CNAuthorizationStatus.NotDetermined)
{
store.RequestAccess(CNEntityType.Contacts, Handle_Contacts_RequestAccess);
}
}
private void Handle_Contacts_RequestAccess(bool granted, NSError error)
{
Console.WriteLine(string.Format("granted : {0}", granted.ToString()));
if (!granted)
{
Console.WriteLine(string.Format("Error : {0}", error.ToString()));
}
}
}
}
AuthorizationStatus : NotDetermined
granted : False
Error : Access Denied