Estoy usando mvc 5 con identidad 2.0. Quiero usar valores de reclamo personalizados sobre la aplicación pero obtengo un valor nulo. ¿Qué estoy haciendo mal?

Código actualizado

Código de inicio de sesión en el controlador de cuenta

if (!string.IsNullOrEmpty(model.UserName) && !string.IsNullOrEmpty(model.Password))
            {
                AuthenticationManager.SignOut(DefaultAuthenticationTypes.ExternalCookie);
                var result = SignInManager.PasswordSignIn(model.UserName, model.Password, model.RememberMe, shouldLockout: false);


                //Generate verification token
                Dictionary<string, string> acceccToken = null;
                if (SignInStatus.Success == 0)
                {
                    var userDeatails = FindUser(model.UserName, model.Password).Result;
                    if (userDeatails != null)
                        acceccToken = GetTokenDictionary(model.UserName, model.Password, userDeatails.Id);
                }
                if (model.RememberMe)
                {
                    HttpCookie userid = new HttpCookie("rembemberTrue", "1");
                    userid.Expires.AddDays(1);
                    Response.Cookies.Add(userid);
                }
                else
                {

                    HttpCookie userid = new HttpCookie("rembemberTrue", "0");
                    userid.Expires.AddDays(1);
                    Response.Cookies.Add(userid);

                }
                #region custom claims


                var claims = new Claim[]
                           {
                    new Claim("urn:Custom:MasterUniqueId", Convert.ToString(Guid.NewGuid()))
                                };
                ClaimsIdentity identity = new ClaimsIdentity(claims, DefaultAuthenticationTypes.ApplicationCookie);
                IAuthenticationManager authenticationManager = System.Web.HttpContext.Current.GetOwinContext().Authentication;
                authenticationManager.SignIn(identity);

Starup.Auth.cs

 public void ConfigureAuth(IAppBuilder app)
        {
            // Configure the db context, user manager and signin manager to use a single instance per request
            app.CreatePerOwinContext(ApplicationDbContext.Create);
            app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
            app.CreatePerOwinContext<ApplicationSignInManager>(ApplicationSignInManager.Create);

            // Enable the application to use a cookie to store information for the signed in user
            // and to use a cookie to temporarily store information about a user logging in with a third party login provider
            // Configure the sign in cookie
            app.UseCookieAuthentication(new CookieAuthenticationOptions
            {
                AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
                LoginPath = new PathString("/Account/Login"),
                Provider = new CookieAuthenticationProvider
                {
                    // Enables the application to validate the security stamp when the user logs in.
                    // This is a security feature which is used when you change a password or add an external login to your account.  
                    OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager, ApplicationUser>(
                        validateInterval: TimeSpan.FromMinutes(30),
                        regenerateIdentity: (manager, user) => user.GenerateUserIdentityAsync(manager))
                },
                SlidingExpiration = true,
                ExpireTimeSpan = TimeSpan.FromMinutes(60)
            });

otro controlador

Aquí estoy tratando de recuperar esos valores de reclamo pero se muestra nulo

var identity = (ClaimsIdentity)User.Identity;
var res= identity.FindFirst("urn:Custom:MasterUniqueId");

res es nulo