CNTLMAuthObject question...

I'm trying to use NTLM authentication in a web service. I've created
the following test but can't seem to get this to work.

==============================================
int _tmain(int argc, _TCHAR* argv[])
{
    bool val = false;
    HRESULT hr = ::CoInitializeEx( NULL, COINIT_MULTITHREADED );
    CAutoPtr<CAtlWsTestService> ws( new CAtlWsTestService( ) );

    CNTLMAuthObject authObject;

    CAtlHttpClient* httpClient = &ws->m_socket;
    val = httpClient->AddAuthObj( _T( "NTLM" ), &authObject);
    ATL::CString name;
    val = authObject.GetCredentialNames( name );
    val = httpClient->NegotiateAuth( false );

    CString inVal( _T( "Test" ) );
    CString outVal;
    hr = ws->HelloWorld(
        (CComBSTR)inVal
        , (BSTR*)&outVal
        );
    ws.Free();
    ::CoUninitialize();
    return 0;
}=======================================

When I try to just get the name using

val = authObject.GetCredentialNames( name );

I get a false return and empty string.

Am I missing something on how this is suppose to work. My test
machine is not part of a domain but in a workgroup and I'm running
this in Vs2005 debugger.

Thanks,
Mike