<PackageReference Include="Microsoft.Identity.Client" Version="4.85.2" />

Microsoft.Identity.Client.AppConfig.PoPOptions

public class PoPOptions
Options that control mTLS Proof-of-Possession (PoP) token acquisition. This type is the extensibility point for PoP-related knobs so future settings can be added without growing the builder surface.
namespace Microsoft.Identity.Client.AppConfig { public class PoPOptions { public MtlsBindingStrength MinStrength { get; set; } public PoPOptions(); } }