Post to group wall using Facebook SDK .net 2015 - facebook

Question

It seems that nowdays there's no way to allow to post onto facebook user groups via a new, unreviewed app.
I've created an App with live features availible to gen public, with approvements for email, public_profile, user_friends.
I'm trying to post on the wall of a group I've created and I'm an admin of.
Now, when firing up my code, I get the nasty "OAuthException - #200) (#200) Insufficient permission to post to target..." exception.
Posting my wall work perfectly...
public class HomeController : Controller
{
private const long GroupId = 15473890820xxxx;
//
// GET: /Home/
public ActionResult Index(string code)
{
ViewBag.Message = "Welcome to Facebook App Demo!";
//user denied permissions on Facebook.
if (Request["error_reason"] == "user_denied")
{
//this is not implemented. For reference only.
return RedirectToAction("LogOn", "Account");
}
if (string.IsNullOrEmpty(code))
{
ViewBag.Error = "There was an error while loggin into Facebook. Please try again later.";
return RedirectToAction("LogOn", "Account");
}
var fb = new FacebookClient();
dynamic result = fb.Post("oauth/access_token", new
{
client_id = "93199615018xxxx",
client_secret = "2089ae4447877e7388500b844235xxxx",
redirect_uri = "http://localhost:13301/",
code = code
});
var appToken = result.access_token as string;
// update the facebook client with the access token so
// we can make requests on behalf of the user
fb.AccessToken = appToken;
//get extended App/User Token
dynamic result2 = fb.Get("oauth/access_token", new
{
client_id = "93199615018xxxx"
client_secret = "2089ae4447877e7388500b844235xxxx",
grant_type="fb_exchange_token",
fb_exchange_token = appToken,
// code = code
});
var extendedAppToken = result2.access_token as string;
//generate Extended User Token (valid for 60 days)
Session["Facebooktoken"] = extendedAppToken;
dynamic me = fb.Get("me/accounts");
var response = fb.Get("/me/accounts?access_token=" + extendedAppToken) as JsonObject;
return View(me);
}
[HttpPost]
public ActionResult Index(FormCollection collection) //rename to PostWall
{
ViewBag.Message = "Welcome to Facebook App Demo!";
// Post to the wall..
try
{
if (Session["Facebooktoken"] != null)
{
string message = collection["txtPost"].ToString();
FacebookClient client = new FacebookClient(Session["Facebooktoken"].ToString());
dynamic result = client.Post(GroupId+"/feed", new
{
message = message
});
ViewBag.SaveMessage = "Successfuly Post on your wall : " + result.id;
}
else
{
return RedirectToAction("LogOn", "Account");
}
}
catch (Exception ex)
{
ModelState.AddModelError("", ex.Message);
}
return View();
}
public ActionResult About()
{
return View();
}
}
public class AccountController : Controller
{
//
// GET: /Account/
public ActionResult LogOn()
{
return View();
}
[HttpPost]
public ActionResult LogOn(LogOnModel model, string returnUrl)
{
var facebookAppId = "93199615018xxxx";
var facebookAppSecret = "2089ae4447877e7388500b844235xxxx";
var facebookRedirectUrl = "http://localhost:13301/";
//
var facebookScope = "email,publish_pages,publish_actions,manage_pages,user_managed_groups,user_hometown,user_website";
if (facebookAppId != null && facebookAppSecret != null && facebookRedirectUrl != null && facebookScope != null)
{
var url = string.Format(#"https://www.facebook.com/dialog/oauth/?client_id={0}&redirect_uri={1}&scope={2}", facebookAppId, facebookRedirectUrl, facebookScope);
Response.Redirect(url, true);
}
return this.RedirectToAction("Index", "Home");
}
}
Any clue on how to set up an testing environment for above functionality without the extra-round of establishing a fully fledged App that has to be reviewed by Facebook admins? I've looked on testing versions for Apps and Users, but no groups either.
Many thanks in advance

Answer 1

Darren, thanks for your considerations. It seems like due to my privacy restrictions I couldnt get any group info of my personal account. Either programmatically, nor manually in Facebooks Graph API Explorer.
It worked finally on an business (fan)'Page' profile by getting an 'long-lived' Page Access Token in facebooks Access Token Debuger.
Yes, user_managed_groups and publish_actions had been enabled.