using AD authenticaiton with correct user id and pwd, but getting the error unable to find authentication policy

[nshehzad]

using this code below, but getting error unable to find authentication policy. Please see screen attached

using Data8.PowerPlatform.Dataverse.Client;
using Microsoft.PowerPlatform.Dataverse.Client;
using Microsoft.Xrm.Sdk;
 
var onPremAD = new OnPremiseClient("https://crm.contoso.com/org/XRMServices/2011/Organization.svc", "AD\\username", "password!");
 
CreateRecord(onPremIfd);
CreateRecord(onPremAD);
CreateRecord(online);

void CreateRecord(IOrganizationService svc)
{
	var entity = new Entity("account")
	{
		["name"] = "Data8"
	};

	entity.Id = svc.Create(entity);
}

[MarkMpn]

The library can't find the details in the WSDL document describing how it should authenticate to the service. I haven't seen this happen on a real server before so I'm not sure what the ultimate fix will be, but to start with it would be useful to see the contents of the WSDL file - start from https://crm.contoso.com/org/XrmServices/2011/Organization.svc?wsdl&sdkversion=8.0.0.0 and also follow any links to imported WSDL documents, normally https://crm.contoso.com/org/XrmServices/2011/Organization.svc?wsdl=wsdl0