<PackageReference Include="Microsoft.Identity.Client" Version="4.83.1" />

Microsoft.Identity.Client.Internal.ClientCredential.ClientAssertionStringDelegateCredential

sealed class ClientAssertionStringDelegateCredential : IClientCredential
Client assertion provided as a string JWT. Cannot return TokenBindingCertificate (no mTLS preflight).
public AssertionType AssertionType { get; }

public Task<ClientCredentialApplicationResult> AddConfidentialClientParametersAsync(OAuth2Client oAuth2Client, AuthenticationRequestParameters p, ICryptographyManager _, string tokenEndpoint, CancellationToken ct)