<PackageReference Include="Microsoft.Identity.Client" Version="4.84.1-preview" />

Microsoft.Identity.Client.OAuth2.TokenClient

class TokenClient
Responsible for talking to the /token endpoint
namespace Microsoft.Identity.Client.OAuth2 { internal class TokenClient { public TokenClient(AuthenticationRequestParameters requestParams); public Task<MsalTokenResponse> SendTokenRequestAsync(IDictionary<string, string> additionalBodyParameters, string scopeOverride = null, string tokenEndpointOverride = null, CancellationToken cancellationToken = default(CancellationToken)); public void AddHeaderToClient(string name, string value); } }