Internal server error when uploading to Bing Ads API v13 - Customer List or Customer List Item in

I am currently uploading the csv file to the Customer List with the contents below

Type,Status,Id,Parent Id,Client Id,Modified Time,Name,Description,Scope,Audience,Action Type

Format Version,,,,,,6.0,,,,,,

Customer List,Active,-1,,af32d10b-7e30-b9e3-3384-3a187e3a3d40,CCYY-03-DDT11:22:52,New Dealerverse Name,New Customer List Dealerverse Description,Customer,New Customer List,Add

And then I have also received the url from IBulkService for me to upload the csv file, now please check the code below:

var bulkService = new ServiceClient

var request = new GetBulkUploadUrlRequest()

{

    AccountId = long.Parse(customerId),

    ResponseMode = ResponseMode.ErrorsAndResults,

};

var response = await bulkService.CallAsync((s, r) => s.GetBulkUploadUrlAsync(r), request);

string uploadUrl = response.UploadUrl;

using (var httpClient = new HttpClient())

{

    using (var fileStream = new FileStream(csvFilePath, FileMode.Open, FileAccess.Read))

    using (var content = new StreamContent(fileStream))

    {

        content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");

        HttpResponseMessage uploadResponse = await httpClient.PostAsync(response.UploadUrl, content);

        if (uploadResponse.IsSuccessStatusCode)

        {

            Console.WriteLine("Bulk file uploaded successfully.");

        }

        else

        {

            Console.WriteLine($"Upload failed. Status Code: {uploadResponse.StatusCode}");

            string errorDetails = await uploadResponse.Content.ReadAsStringAsync();

            Console.WriteLine($"Error Details: {errorDetails}");

            return false;

        }

    }

}

The problem is in this line HttpResponseMessage uploadResponse = await httpClient.PostAsync(response.UploadUrl, content);

The response is IsSuccessStatusCode = false And when you look at the response error details it shows Internal Server Error.

From my perspective the BingAdsAPI V13 Customer List endpoint is having an internal server error. And if I am mistaken, is there any way we can fix it by any means of modification in the code.

Please help.