HttpWebRequest doesn't work: unexpected error occurred on a receive

Question

TLS is TLS 1.3, Linux server.
Cipher: TLS_AES_256_GCM_SHA384
error: unexpected error occurred on a receive '''

            ServicePointManager.Expect100Continue = true;
            ServicePointManager.DefaultConnectionLimit = 9999;
            ServicePointManager.SecurityProtocol = (SecurityProtocolType)12288;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(@"https://example.com/oauth/token?grant_type=password&username=aptk0012&password=9875322");
            request.Method = "POST";
            request.ContentType = "application/json";
            string post_data = "Basic VV9mZ.....";
            request.Headers.Add("Authorization", post_data);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream dataStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(dataStream);
            string result = reader.ReadToEnd();

''' But Postman does it.

Pls help me here!!!

full error detail is here:

'''See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---> System.ComponentModel.Win32Exception: The client and server cannot communicate, because they do not possess a common algorithm
   at System.Net.SSPIWrapper.AcquireCredentialsHandle(SSPIInterface SecModule, String package, CredentialUse intent, SecureCredential scc)
   at System.Net.Security.SecureChannel.AcquireCredentialsHandle(CredentialUse credUsage, SecureCredential& secureCredential)
   at System.Net.Security.SecureChannel.AcquireClientCredentials(Byte[]& thumbPrint)
   at System.Net.Security.SecureChannel.GenerateToken(Byte[] input, Int32 offset, Int32 count, Byte[]& output)
   at System.Net.Security.SecureChannel.NextMessage(Byte[] incoming, Int32 offset, Int32 count)
   at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
   at System.Net.TlsStream.CallProcessAuthentication(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)
   at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.ConnectStream.WriteHeaders(Boolean async)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.GetResponse()
   at WindowsFormsApplication1.Form1.ND_Get_Token(String username, String password, LabelControl lbMessage, Boolean is_show_msg) in C:\Users\orgil\OneDrive\Documents\Visual Studio 2015\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs:line 512
   at WindowsFormsApplication1.Form1.btGetEMDToken_Click(Object sender, EventArgs e) in C:\Users\orgil\OneDrive\Documents\Visual Studio 2015\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs:line 488

'''