public async Task <ActionResult> CreateUser()
        {
            var id   = Guid.NewGuid().ToString("N").Substring(0, 6);
            var user = new User
            {
                CreationType   = "LocalAccount",
                AccountEnabled = true,
                GivenName      = $"John-{id}",
                Surname        = $"Smith-{id}",
                DisplayName    = $"Megatron{id}",
                JobTitle       = "Sr. Random User",
                SignInNames    = new List <SignInName>
                {
                    new SignInName()
                    {
                        Type  = "emailAddress",
                        Value = $"john-{id}@smith.com"
                    }
                },
                PasswordProfile = new PasswordProfile
                {
                    EnforceChangePasswordPolicy  = false,
                    ForceChangePasswordNextLogin = false,
                    Password = "******"
                }
            };

            user.SetExtendedProperty(TaxRegistrationNumberPropertyName, $"{DateTime.Now.Millisecond}{DateTime.Now.Millisecond}");

            var newUser = await GraphClient.UserCreateAsync(user);

            return(Json(newUser));
        }