<PackageReference Include="Microsoft.Identity.Client" Version="4.86.0" />

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.
public MtlsBindingStrength MinStrength { get; set; }

Gets or sets the minimum binding strength the host must be able to produce for the request to succeed. This is a floor assertion, not a downgrade selector: MSAL always uses the host's maximum binding strength, and the request fails when the host cannot meet this floor.

public PoPOptions()