The server committed a protocol violation. Section=ResponseStatusLine : Issue - asp.net-core

Question

I created ASP.NET core 6 API project and used JWT authentication for each API end point.
But while executing in some physical system works fine but some other physical system and server throws below error
The server committed a protocol violation. Section=ResponseStatusLine
Sample Code
var request = (HttpWebRequest)WebRequest.Create(endpoint);
var token = System.Threading.Tasks.Task.Run(async() => await new Token("URL", "username", "pwd"])).Result;
request.Headers.Add("Authorization", "Bearer " + token);
request.Method = "POST";
var postData = JsonConvert.SerializeObject(Details, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });
var data = Encoding.ASCII.GetBytes(postData);
request.ContentType = "application/json";
request.ContentLength = data.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
var responses = (HttpWebResponse)request.GetResponse();
Sample code based on HTTP Client
using (var httpClient = new HttpClient())
{
using (var request = new HttpRequestMessage(new HttpMethod("POST"), endpoint))
{
string token = SalesOperationAPIToken("url", "usertest", "pwd");
request.Headers.TryAddWithoutValidation("accept", "*/*");
request.Headers.TryAddWithoutValidation("Authorization", "Bearer " + token);
string json = JsonConvert.SerializeObject(Details);
request.Content = new StringContent(json);
request.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json");
var response = httpClient.SendAsync(request).Result;
var responseMessage = response.Content.ReadAsStringAsync().Result;
}
}
I am not sure what configuration need to be changed to get this worked in all system.
Thanks in advance.