How to rectify the custom username password validation issue in WCF service in ASP.NET with C# ?

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ASP.NET

web.config

WCFService

I am doing Custom UserName Password Validation for WCF Service in asp.net with c#. I have set a WCF Service Library and set the Authenticator Class in it. Added to my WCF Service, Updated as required in the web.config. However while calling the API Method from Client Side , I am able to fetch the response from Server Side But the validate override method is not hitting on debugging/working.

I am using http protocol here.

What I have tried:

Authentication Class

public override void Validate(string userName, string password)
       {
           //validate arguments
           if (string.IsNullOrEmpty(userName))
           {
               throw new ArgumentNullException(userName);
           }
           if (string.IsNullOrEmpty(password))
           {
               throw new ArgumentNullException(password);
           }
           //check if user is not test
           if (userName!="test" || password != "test")
           {
               throw new FaultException("Incorrect Username or Password");
           }
       }

Web.config update for the Authentication case set

<serviceCredentials>
            <userNameAuthentication userNamePasswordValidationMode="Custom"
             customUserNamePasswordValidatorType="TruckService.ServiceLibrary.TruckService,TruckService.ServiceLibrary" />
          </serviceCredentials>
  <security mode="TransportWithMessageCredential">
            <message clientCredentialType="UserName"/>
          </security>

Calling from Client Side

using (ServiceReference1.TruckServiceClient obj = new ServiceReference1.TruckServiceClient())
            {
                obj.ClientCredentials.UserName.UserName = "test";
                obj.ClientCredentials.UserName.Password = "test";
                string returndata = obj.GetData(100);
            }