public static bool ContinueUserActivity(UIApplication application, NSUserActivity userActivity, UIApplicationRestorationHandler completionHandler)
 => WebAuthenticator.OpenUrl(new Uri(userActivity?.WebPageUrl?.AbsoluteString));
 public static bool OpenUrl(UIApplication app, NSUrl url, NSDictionary options)
 => WebAuthenticator.OpenUrl(new Uri(url.AbsoluteString));