<PackageReference Include="Microsoft.Identity.Client" Version="4.84.2-preview" />

Microsoft.Identity.Client.Internal.ClientCredential.IClientSignedAssertionProvider

Capability interface: implemented only by credentials that can produce a ClientSignedAssertion (JWT + optional TokenBindingCertificate).
namespace Microsoft.Identity.Client.Internal.ClientCredential { internal interface IClientSignedAssertionProvider { Task<ClientSignedAssertion> GetAssertionAsync(AssertionRequestOptions options, CancellationToken cancellationToken); } }