.Net Core - Impersonation Help!

Hello EE Community,

I have been struggling trying to figure out how the heck to impersonate via .Net Core API  sending a HttpWebRequest as the Windows Identity user.   I have tried forum articles out there and posting what I tried last but this does not work.   It works fine when I run via IIS Express I have Windows Authentication and Anonymous on that I need for now.   When I run via IIS Express the "DefaultCredentials" are picking up my credentials but when I run deployed to IIS the Application Pool identity is using a service account which I understand but now I need to impersonate and with Core it seems so difficult.   This is what I am trying when deploying to IIS but it is not working and still picking up the app pool identity service account versus my Windows Identity essentially.   The Windows Identity has myself correct but the DefaultCredentials does not it uses the app pool.   I tried this via forum articles still no dice the CredentialCache.DefaultCredentials is still the app pool.  Needing help understanding how to handle this in Core.

  WindowsIdentity identity = (WindowsIdentity)_httpContextAccessor.HttpContext.User.Identity;
                WindowsIdentity.RunImpersonated(identity.AccessToken, () =>
                {
                    Uri theUri = new Uri(string.Concat(this.session.HostURL, "/refi/services"));
                    HttpWebRequest theHttpWebRequest = (HttpWebRequest)WebRequest.Create(theUri);
                    theHttpWebRequest.Credentials = CredentialCache.DefaultCredentials;
                    theHttpWebRequest.Timeout = 210000;
                    theHttpWebRequest.CookieContainer = session.CookieContainer;
                    HttpWebResponse theHttpWebResponse = (HttpWebResponse)theHttpWebRequest.GetResponse();
                    theHttpWebResponse.Close();
                });

Select allOpen in new window