我正在尝试使用C# for AWS Cognito调用ConfirmForgotPassword。当使用下面的代码时，我得到的只是一个异常“请求不包含有效参数”，没有其他信息。
有没有办法找出无效参数是什么？

using (var cognito = new AmazonCognitoIdentityProviderClient(AWS_AccessKey, AWS_SecretKey, AWSRegion))
{
    ConfirmForgotPasswordRequest confirmForgotPasswordRequest = new ConfirmForgotPasswordRequest();
    confirmForgotPasswordRequest.Username = userName;
    confirmForgotPasswordRequest.ClientId = clientId;
    confirmForgotPasswordRequest.Password = password;
    confirmForgotPasswordRequest.ConfirmationCode = confirmationCode;
    ConfirmForgotPasswordResponse confirmForgotPasswordResponse = new ConfirmForgotPasswordResponse();
    try
    {
        confirmForgotPasswordResponse = await cognito.ConfirmForgotPasswordAsync(confirmForgotPasswordRequest);
    }
    catch (Exception ex)
    {
      // Raises exception "Request does not contain valid parameters"
    }
    
}

我不确定secret hash参数是否是必需的，我已经在下面的代码中尝试过了，得到了相同的结果

confirmForgotPasswordRequest.SecretHash = HmacSha256(userName + clientId, clientSecret);

private string HmacSha256(string message, string secret)
{
    ASCIIEncoding encoding = new ASCIIEncoding();
    byte[] keyBytes = encoding.GetBytes(secret);
    byte[] messageBytes = encoding.GetBytes(message);
    System.Security.Cryptography.HMACSHA256 cryptographer = new System.Security.Cryptography.HMACSHA256(keyBytes);

    byte[] bytes = cryptographer.ComputeHash(messageBytes);

    return BitConverter.ToString(bytes).Replace("-", "").ToLower();
}