<PackageReference Include="System.ServiceModel.Primitives" Version="8.1.0" />

System.ServiceModel.Security.SspiSecurityTokenProvider

namespace System.ServiceModel.Security { public class SspiSecurityTokenProvider : SecurityTokenProvider { public SspiSecurityTokenProvider(NetworkCredential credential, bool allowNtlm, TokenImpersonationLevel impersonationLevel); public SspiSecurityTokenProvider(NetworkCredential credential, bool extractGroupsForWindowsAccounts, bool allowUnauthenticatedCallers); } }