Not able to post data using iflurlclient in ASP.NET core 6

public async Task<Member> AddMember(Member member)
        {
            var model = new Member();

            try
            {
                var retval = await _flurlClient.Request(Constants.AddMember)
                                               .PostJsonAsync(new Member()
                                               {
                                                   MemberId = member.MemberId,
                                                   SrNo = member.SrNo,
                                                   SeatNo = member.SeatNo,
                                                   Name = member.Name,
                                                   Gender = member.Gender,
                                                   FatherName = member.FatherName,
                                                   MotherName = member.MotherName,
                                                   HighestQualification = member.HighestQualification,
                                                   PreparingFor = member.PreparingFor,
                                                   PreferredBookName = member.PreferredBookName,
                                                   PermanentAddress = new Address()
                                                   {
                                                       Id = member.PermanentAddress.Id,
                                                       Village_Mohalla = member.PermanentAddress.Village_Mohalla,
                                                       PoliceStation = member.PermanentAddress.PoliceStation,
                                                       PostOffice = member.PermanentAddress.PostOffice,
                                                       District = member.PermanentAddress.District,
                                                       PinCode = member.PermanentAddress.PinCode,
                                                       AddressType = member.PermanentAddress.AddressType,
                                                       Description = member.PermanentAddress.Description,
                                                       IsActive = true
                                                   },
                                                   LocalAddress = new Address()
                                                   {
                                                       Id = member.LocalAddress.Id,
                                                       Village_Mohalla = member.LocalAddress.Village_Mohalla,
                                                       PoliceStation = member.LocalAddress.PoliceStation,
                                                       PostOffice = member.LocalAddress.PostOffice,
                                                       District = member.LocalAddress.District,
                                                       PinCode = member.LocalAddress.PinCode,
                                                       AddressType = member.LocalAddress.AddressType,
                                                       Description = member.LocalAddress.Description,
                                                       IsActive = true
                                                   },
                                                   FatherMobileNo = member.FatherMobileNo,
                                                   MobileNo = member.MobileNo,
                                                   FormPath = member.FormPath,
                                                   DocumentPath = member.DocumentPath,
                                                   ExitDate = member.ExitDate,
                                                   IsActive = true,
                                                   CreatedBy = 0
                                               });
            }
            catch (FlurlHttpException ex)
            {
                var error = await ex.GetResponseJsonAsync();
                //logger.Write($"Error returned from {ex.Call.Request.Url}: {error.SomeDetails}");
            }
            return member;
        }

var retval = await _flurlClient.Request(Constants.AddMember)
                                               .PostJsonAsync(objMember)

{
  "memberId": 0,
  "srNo": 0,
  "seatNo": 0,
  "name": "string",
  "gender": 0,
  "fatherName": "string",
  "motherName": "string",
  "highestQualification": "string",
  "preparingFor": "string",
  "preferredBookName": "string",
  "permanentAddress": {
    "addressId": 0,
    "village_Mohalla": "string",
    "policeStation": "string",
    "postOffice": "string",
    "district": "string",
    "pinCode": 0,
    "addressType": 0,
    "description": "string",
    "isActive": 0
  },
  "localAddress": {
    "addressId": 0,
    "village_Mohalla": "string",
    "policeStation": "string",
    "postOffice": "string",
    "district": "string",
    "pinCode": 0,
    "addressType": 0,
    "description": "string",
    "isActive": 0
  },
  "fatherMobileNo": "string",
  "mobileNo": "string",
  "formPath": "string",
  "documentPath": "string",
  "exitDate": "string",
  "isActive": 0,
  "createdBy": 0
}