Авторизация локального мобильного приложения через c# Xamarin

Есть такой код из примера для авторизации по протоколу oauth для гугла.

////////////////////////////////
public partial class OAuthNativeFlowPage : ContentPage
    {
        Account account;
        AccountStore store;

        public OAuthNativeFlowPage()
        {
            InitializeComponent();

            store = AccountStore.Create();
        }

        void OnLoginClicked(object sender, EventArgs e)
        {
            string clientId = null;
            string redirectUri = null;

            switch (Device.RuntimePlatform)
            {
                case Device.iOS:
                    clientId = Constants.iOSClientId;
                    redirectUri = Constants.iOSRedirectUrl;
                    break;

                case Device.Android:
                    clientId = Constants.AndroidClientId;
                    redirectUri = Constants.AndroidRedirectUrl;
                    break;
            }

            account = store.FindAccountsForService(Constants.AppName).FirstOrDefault();

            var authenticator = new OAuth2Authenticator(
                clientId,
                null,
                Constants.Scope,
                new Uri(Constants.AuthorizeUrl),
                new Uri(redirectUri),
                new Uri(Constants.AccessTokenUrl),
                null,
                true);

            authenticator.Completed += OnAuthCompleted;
            authenticator.Error += OnAuthError;

            AuthenticationState.Authenticator = authenticator;

            var presenter = new Xamarin.Auth.Presenters.OAuthLoginPresenter();
            presenter.Login(authenticator);
        }

        async void OnAuthCompleted(object sender, AuthenticatorCompletedEventArgs e)
        {
            var authenticator = sender as OAuth2Authenticator;
            if (authenticator != null)
            {
                authenticator.Completed -= OnAuthCompleted;
                authenticator.Error -= OnAuthError;
            }

            User user = null;
            if (e.IsAuthenticated)
            {
                
                // If the user is authenticated, request their basic user data from Google
                // UserInfoUrl = https://www.googleapis.com/oauth2/v2/userinfo
                var request = new OAuth2Request("GET", new Uri(Constants.UserInfoUrl), null, e.Account);
                var response = await request.GetResponseAsync();
                if (response != null)
                {
                    // Deserialize the data and store it in the account store
                    // The users email address will be used to identify data in SimpleDB
                    string userJson = await response.GetResponseTextAsync();
                    user = JsonConvert.DeserializeObject(userJson);
                }

                if (account != null)
                {
                    store.Delete(account, Constants.AppName);
                }

                await store.SaveAsync(account = e.Account, Constants.AppName);
                await DisplayAlert("Email address", user.Email, "OK");
            }
        }

        void OnAuthError(object sender, AuthenticatorErrorEventArgs e)
        {
            var authenticator = sender as OAuth2Authenticator;
            if (authenticator != null)
            {
                authenticator.Completed -= OnAuthCompleted;
                authenticator.Error -= OnAuthError;
            }

            Debug.WriteLine("Authentication error: " + e.Message);
        }
    }

///////////////////////////////////

Как его переделать под битрикс24? а точнее что вставлять в эти параметры?

var authenticator = new OAuth2Authenticator(
                clientId,
                null,
                Constants.Scope,
                new Uri(Constants.AuthorizeUrl),
                new Uri(redirectUri),
                new Uri(Constants.AccessTokenUrl),
                null,
                true);
Авторизированный юрл, редирект и ацес токен.
подставил
AuthorizeUrl = "https://profiescort.bitrix24.ru/oauth/authorize/?
AccessTokenUrl = "https://portal.bitrix24.com/oauth/authorize/?
RedirectUrl = "https://portal.bitrix24.com/oauth/authorize/?local.5c6e98674befd9.58558239";
Пишет приложение не найдено при ответе.
Даже так, первое время выдавал логин окошко битрикс, один раз залогинился, теперь пишет Приложение не найдено