How to send a request from Xamarin to the REST API server to change a record in the database?

Question

Xamarin

Hello, I'm sending a request like this

User u = new User("4", "My email.", false , "My Firstname", "", "My Lastname", "", "", "", "City", "10000", "Street", "", "");
            string url = Constants.URL + "/4";
            var client = new HttpClient();
            var json = JsonConvert.SerializeObject(u);
            var content = new StringContent(json, Encoding.UTF8, "application/json");
            var response = await client.PutAsync(url, content);
            Console.WriteLine("Response " + response);

In the database the columns


AND the user itself looks like this

class User
    {
        [JsonProperty("id")]
        public string Id { get; set; }

        [JsonProperty("email")]
        public string Email { get; set; }

        [JsonProperty("verified_email")]
        public bool VerifiedEmail { get; set; } // TODO DELETE

        [JsonProperty("username")]
        public string UserName { get; set; }

        [JsonProperty("given_name")]
        public string GivenName { get; set; } // TODO DELETE

        [JsonProperty("family_name")]
        public string FamilyName { get; set; } // TODO DELETE

        [JsonProperty("link")]
        public string Link { get; set; }

        [JsonProperty("picture")]
        public string Picture { get; set; }

        [JsonProperty("gender")]
        public string Gender { get; set; } // TODO DELETE




        [JsonProperty("address_city")]
        public string City { get; set; }

        [JsonProperty("address_plz")]
        public string PLZ { get; set; }

        [JsonProperty("address_street")]
        public string Street { get; set; }

        [JsonProperty("lastvisit")]
        public string LastVisit { get; set; }

        [JsonProperty("created")]
        public string  Created { get; set; }

      //Далее методы, конструкторы и т д

There are no changes in the database