Could not establish secure channel for SSL/TLS with authority in .net 5

Question

I am getting this error only with the application developed in .net 5.0,. For .net 4.5* application it is working fine. With .net 5.0 console application when calling WCF service getting SSl/TLS issue. Already tried below code but not working:

ServicePointManager.ServerCertificateValidationCallback += ValidateServerCertficate;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
            ServicePointManager.Expect100Continue = true;

I have written this lines in Main function before creating the host:

  Host.CreateDefaultBuilder(args)

Complete error is as below: Could not establish trust relationship for the SSL/TLS secure channel with authority

Binding Used for WCF call is as below:

var binding = new BasicHttpsBinding
            {
                CloseTimeout = new TimeSpan(0, 1, 0),
                OpenTimeout = new TimeSpan(0, 1, 0),
                ReceiveTimeout = new TimeSpan(0, 1, 0),
                SendTimeout = new TimeSpan(0, 1, 0),
                MaxBufferPoolSize = 2147483647,
                MaxBufferSize = 2147483647,
                MaxReceivedMessageSize = 2147483647,
                TransferMode = TransferMode.Buffered,
                UseDefaultWebProxy = true,
                AllowCookies = false,
                MessageEncoding = WSMessageEncoding.Mtom,
                Name = "dlBinding",
                BypassProxyOnLocal = false,

                Security =
            {
                Mode = BasicHttpsSecurityMode.TransportWithMessageCredential,
                Transport = new HttpTransportSecurity
                {
                    ClientCredentialType = HttpClientCredentialType.Certificate,
                    ProxyCredentialType = HttpProxyCredentialType.Basic,
                }
            }
            };