Asp.net MVC ReturnUrl value always null

OK I'v researched and tried every single suggestion (individually of course) before posting this and I hit a wall every time

This is my log in view I used ViewBag to pass the ReturnUrl value as I've seen in many answers to this problem

   <h2>Login</h2>
@using (Html.BeginForm("Login", "Account", new { ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post, new { role = "form" }))
{
    @Html.AntiForgeryToken()


  ...............

And this is the login action result

   [HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public ActionResult Login(UserLogin login, string returnUrl="")
{
    string message = "";
    using (NerdsContext nc = new NerdsContext())
    {
        var v = nc.User.Where(a => a.email == login.email).FirstOrDefault();
        if (v != null)
        {
            if (!v.IsEmailVerified)
            {
                ViewBag.Message = "Please verify your email first";
                return View();
            }
            if (string.Compare(Crypto.Hash(login.password), v.password) == 0)
            {
                int timeout = login.rememberMe ? 525600 : 20; // 525600 min = 1 year
                var ticket = new FormsAuthenticationTicket(login.email, login.rememberMe, timeout);
                string encrypted = FormsAuthentication.Encrypt(ticket);
                var cookie = new HttpCookie(FormsAuthentication.FormsCookieName, encrypted);
                cookie.Expires = DateTime.Now.AddMinutes(timeout);
                cookie.HttpOnly = true;
                Response.Cookies.Add(cookie);

                //Redirect the user to new url
                if (Url.IsLocalUrl(returnUrl))
                {
                    ViewBag.ReturnUrl = returnUrl;
                    return Redirect(returnUrl);

                }
                else
                {
                    return RedirectToAction("Nerd", "Home");
                }
            }
            else
            {
                message = "Invalid credential provided";
            }
        }
        else
        {
            message = "Invalid credential provided";
        }
    }
    ViewBag.Message = message;
    return View();
}

And finally this is the lines I added in web.config file

 <authentication mode="Forms">
      <forms cookieless="UseCookies"  loginUrl="/Account/Login"  timeout="30" slidingExpiration="true" protection="All"></forms>
    </authentication>

And when I run this I never get to actually login it always send me back to the login page and the value of the returnUrl is always null So what is going on here????

OK after much search I found my answer here [Request.IsAuthenticated is always false ]

I had to add these line in my web.config's modules inside system.WebServer

<remove name="FormsAuthentication" />
      <add name="FormsAuthentication" type="System.Web.Security.FormsAuthenticationModule" />