I cannot connect to soap service with https

Question

When I run the following code block; Even though the service address is correct, I get an error. What is the reason?

My code:

WSHttpBinding binding = new WSHttpBinding();

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12 | SecurityProtocolType.Ssl3;

if (scheme == "https")
{
    binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;
    binding.Security.Mode = SecurityMode.Transport;
}
else
{
    binding.Security.Mode = SecurityMode.None;
}

binding.Name = "MyServiceSoap";
binding.CloseTimeout = TimeSpan.MaxValue;
binding.OpenTimeout = TimeSpan.MaxValue;
binding.ReceiveTimeout = TimeSpan.MaxValue;
binding.SendTimeout = TimeSpan.MaxValue;
binding.MaxBufferPoolSize = 2147483647;
binding.MaxReceivedMessageSize = 2147483647;

X509Certificate2 serverCert = new X509Certificate2(Encoding.UTF8.GetBytes("kvfhgfucjfcvbıclngffsdıfgbuhb");

EndpointIdentity identity = EndpointIdentity.CreateX509CertificateIdentity(serverCert);
EndpointAddress endAddr = new EndpointAddress(new Uri(url + "/UserService.svc"), identity);

ApiService.UserServiceClient srv = new ApiService.UserServiceClient(binding, endAddr);
srv.ClientCredentials.UserName.UserName = "auth";
srv.ClientCredentials.UserName.Password = "hugghu!.";

System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
System.Net.ServicePointManager.Expect100Continue = false;

var list = srv.GetAllByUsers();

Error:

System.ServiceModel.EndpointNotFoundException: There was no endpoint listening at http://..... that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.

System.Net.WebException: The remote server returned an error: (404) Not Found.

at System.Net.HttpWebRequest.GetResponse()
at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
--- End of inner exception stack trace ---

Server stack trace:
at System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException(WebException webException, HttpWebRequest request, HttpAbortReason abortReason)
at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

What I tried:

if (scheme == "https")
{
    srv.ClientCredentials.ServiceCertificate.SslCertificateAuthentication = new X509ServiceCertificateAuthentication()
         {
             CertificateValidationMode = X509CertificateValidationMode.None,
         };
}

ServicePointManager.ServerCertificateValidationCallback +=(sender, cert, chain, sslPolicyErrors) => true;

ServicePointManager.ServerCertificateValidationCallback = delegate (object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; };