<PackageReference Include="System.Security.Principal.Windows" Version="5.0.0-preview.8.20407.11" />

System.Security.Principal.IdentityNotMappedException

Represents an exception for a principal whose identity could not be mapped to a known identity.
namespace System.Security.Principal { public sealed class IdentityNotMappedException : SystemException { public IdentityReferenceCollection UnmappedIdentities { get; } public IdentityNotMappedException(); public IdentityNotMappedException(string message); public IdentityNotMappedException(string message, Exception inner); } }