Facebook web application extended permissions second step dont show

I got the same problem. As you did, I configured the RegisterFacebookClient with dictionary to define my app's scope, and unfortunately the request didn't include the scope as I configured. So I found that. It seems that would work, but it wasn't enough. So I found this.

So here is what solve my problems:

First of all I added this new client to my code:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using DotNetOpenAuth.AspNet;
using Newtonsoft.Json;

namespace MyApp.UI.Infrastructure
{
    public class FacebookScopedClient : IAuthenticationClient
    {
        private string appId;
        private string appSecret;
        private string scope;

        private const string baseUrl = "https://www.facebook.com/dialog/oauth?client_id=";
        public const string graphApiToken = "https://graph.facebook.com/oauth/access_token?";
        public const string graphApiMe = "https://graph.facebook.com/me?";

        private static string GetHTML(string URL)
        {
            string connectionString = URL;

            try
            {
                System.Net.HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(connectionString);
                myRequest.Credentials = CredentialCache.DefaultCredentials;
                //// Get the response
                WebResponse webResponse = myRequest.GetResponse();
                Stream respStream = webResponse.GetResponseStream();
                ////
                StreamReader ioStream = new StreamReader(respStream);
                string pageContent = ioStream.ReadToEnd();
                //// Close streams
                ioStream.Close();
                respStream.Close();
                return pageContent;
            }
            catch (Exception)
            {
            }
            return null;
        }

        private IDictionary<string, string> GetUserData(string accessCode, string redirectURI)
        {
            string token = GetHTML(graphApiToken + "client_id=" + appId + "&redirect_uri=" + HttpUtility.UrlEncode(redirectURI) + "&client_secret=" + appSecret + "&code=" + accessCode);
            if (token == null || token == "")
            {
                return null;
            }
            string access_token = token.Substring(token.IndexOf("access_token="), token.IndexOf("&"));
            string data = GetHTML(graphApiMe + "fields=id,name,email,username,gender,link&" + access_token);

            // this dictionary must contains
            Dictionary<string, string> userData = JsonConvert.DeserializeObject<Dictionary<string, string>>(data);
            return userData;
        }

        public FacebookScopedClient(string appId, string appSecret, string scope)
        {
            this.appId = appId;
            this.appSecret = appSecret;
            this.scope = scope;
        }

        public string ProviderName
        {
            get { return "facebook"; }
        }

        public void RequestAuthentication(System.Web.HttpContextBase context, Uri returnUrl)
        {
            string url = baseUrl + appId + "&redirect_uri=" + HttpUtility.UrlEncode(returnUrl.ToString()) + "&scope=" + scope;
            context.Response.Redirect(url);
        }

        public AuthenticationResult VerifyAuthentication(System.Web.HttpContextBase context)
        {
            string code = context.Request.QueryString["code"];

            string rawUrl = context.Request.Url.OriginalString;
            //From this we need to remove code portion
            rawUrl = Regex.Replace(rawUrl, "&code=[^&]*", "");

            IDictionary<string, string> userData = GetUserData(code, rawUrl);

            if (userData == null)
                return new AuthenticationResult(false, ProviderName, null, null, null);

            string id = userData["id"];
            string username = userData["username"];
            userData.Remove("id");
            userData.Remove("username");

            AuthenticationResult result = new AuthenticationResult(true, ProviderName, id, username, userData);
            return result;
        }
    }
}

I put it on a folder "infrastructure" in my asp.net solution with oder stuff, next I change my old configuration, in order to use the new facebook client, as follows:

Old code:

OAuthWebSecurity.RegisterFacebookClient(
appId: "<app-id>",
appSecret: "<app-secret>",
displayName: "Facebook",
extraData: facebookExtraData);

New Code:

OAuthWebSecurity.RegisterClient(
                    new FacebookScopedClient(
                        "<app-id>",
                        "<app-secret>",
                        "scope"), 
                    "Facebook", 
                    null);

That's it. It may help you, as helped me.

First of all, offline_access does not exist any more, so it from the permissions you are asking for.

"[app] which need pretty much all available user permissions from facebook"

Facebook actively discourages asking for heaps of permissions straight from the beginning "just in case" because they might be needed later. One should only ask for an extended permission when it is actually needed for an action the user just triggered for the first time.

Also, you are supposed to ask for "read" and "write" permissions separately.

I don't know if these aspects are actually triggering your error - but I know that Facebook has already been sending out developer alerts for the read/write thing; although an FB employee confirmed that those alerts can be ignored for now, they might start enforcing this at some point in the future.

Is your app registered for these scopes? I'm familiar with Google OAuth, they have a separate scope that maps to one permission. Your app should be registered for the scopes, in order to get the 2nd window. Else, you'll have access only to the public info that your 1st popup asks for..