An unsecured or incorrectly secured fault was received from the other party. See the inner FaultException for the fault code and detail

When I try to execute a CRM CRUD operation using a Console App, I'm getting the following error:

System.ServiceModel.Security.MessageSecurityException   HResult=0x80131501   Message=An unsecured or incorrectly secured fault was received from the other party. See the inner FaultException for the fault code and detail.   Source=mscorlib

class Program
{

    static void Main(string[] args)
    {
         IOrganizationService _serviceProxy = crmConnection();

         Entity con = new Entity("contact");
         con["lastname"] = "test"; 
         _serviceProxy.Create(con);
    }
    private static IOrganizationService crmConnection()
    {
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
    Uri oUri = new Uri("https://XXXXXXXX.api.crm.dynamics.com/XRMServices/2011/Organization.svc");          
    ClientCredentials clientCredentials = new ClientCredentials();
    clientCredentials.UserName.UserName = "XXXXXXXXXXXX";
    clientCredentials.UserName.Password = "XXXXXXXXXXXXXXXXXX";  
    OrganizationServiceProxy _serviceProxy = new OrganizationServiceProxy(oUri, null,clientCredentials,null);
    _serviceProxy.Timeout = new TimeSpan(0, 10, 0);
    return _serviceProxy;
    }
}

Thanks in advance.

An unsecured or incorrectly secured fault was received from the other party

Try using Connection String with XrmTooling this way you can avoid call directly to the Organization.svc and handle the redirection to the SDK

var conn = new CrmServiceClient("AuthType=Office365;Username=xxx@xxx.com; Password=yyyyyy;Url=https://xxxx.crm.dynamics.com;RequireNewInstance=True");
IOrganizationService _orgService = conn.OrganizationWebProxyClient ?? (IOrganizationService)conn.OrganizationServiceProxy;
return _orgService;  

If the error continues could be related to differences between your PC time and the Dynamics Server ajusted +-4 minutes and try again.

Hope it helps