Twitter Login using OAuth

Hello,

I'm trying to do a Login with Twitter using Xamarin.Auth, on Android I had to use a custom schema url and works well, but on iOS after the webview is displayed a screen saying "Redirecting you back to your application, this may take a few minutes", it's never closed, so I never can get the authentication completed.

Here's my code

        var topController = GetTopViewController();
        var auth = new OAuth1Authenticator(
            consumerKey: Constants.consumerKey,
            consumerSecret: Constants.consumerSecret,
            requestTokenUrl: Constants.requestTokenUrl, 
            authorizeUrl: Constants.authorizeUrl, 
            accessTokenUrl: Constants.accessTokenUrl,
            callbackUrl: new Uri("http://twitter.com")
        );


        var _twitterController = auth.GetUI ();
        auth.Completed += (sender, eventArgs) => {
            _twitterController.DismissViewController (true, null);

            if (eventArgs.IsAuthenticated) 
            {
                //Stuff with authentication data
            }
        };
        topController.PresentViewController (_twitterController, true, null);
    }

I'm using a DependencyService, I've already tried callbackUrl using a scheme registered on the info.plist, but it doesn't work also.

I hope someone can help me.