i'm getting the error for an console app as" An unsecured or incorrectly secured fault was received from the other party. See the inner FaultException for the fault code and detail."

IOrganizationService organizationService = null;
try
{
ClientCredentials clientCredentials = new ClientCredentials();
clientCredentials.UserName.UserName = "......onmicrosoft.com";
clientCredentials.UserName.Password = "password";
// For Dynamics 365 Customer Engagement V9.X, set Security Protocol as TLS12
// ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

organizationService = (IOrganizationService)new OrganizationServiceProxy(new Uri("">-------.api.crm8.dynamics.com/.../Organization.svc"),
null, clientCredentials, null);
if (organizationService != null)
{
// Guid userid = ((WhoAmIResponse)organizationService.Execute(new WhoAmIRequest())).OrganizationId;
Guid userid = ((WhoAmIResponse)organizationService.Execute(new WhoAmIRequest())).UserId;

if (userid != Guid.Empty)
{
Console.WriteLine("Connection Successful!...");
}

}
else
{
Console.WriteLine("Failed to Established Connection!!!");
}