<PackageReference Include="Azure.Core" Version="1.63.0" />

Azure.Identity.AppContextSwitches

static class AppContextSwitches
First-party-only feature switches resolved from AppContext with an environment variable fallback. These are intentionally not exposed on the public API surface.
namespace Azure.Identity { internal static class AppContextSwitches { public static bool EnableClientCertificateMtlsProofOfPossession { get; } } }