✅ Exception message not working

public class WebhookExecutionFailedException : Exception
{
  internal WebhookExecutionFailedException(string message, WebhookError error, HttpResponseMesage response) : base(message)
  {
    ErrorMessage = error.Message;
    ErrorCode = error.Code;
    Response = response;
  }

  public string ErrorMessage { get; private set; }

  public int ErrorCode { get; private set; }

  public HttpResponseMessage { get; private set; }
}

throw new WebhookExecutionFailedException(error.Message, error, response);