Facing the Issue while connecting to the Workflow API and SmartObject API

Hi Team,

I enabled the Workflow and SmartObject API in the k2 management. K2 is hosted in the Windows 2025 VM and installed version is K2 Five 5.8 . I am able to connect to the API while i am debugging the application locally. I am not able to connect to the API while deployed to my QA Environment.

I validated in the K2 server registry TLS 1.2 is enabled. In the .net framework code i am taking care of the TLS 1.2 protocol

foreach (SecurityProtocolType protocol in Enum.GetValues(typeof(SecurityProtocolType)))
            {
                if (protocol.GetHashCode() == 3072)
                {
                    platformSupportsTls12 = true;
                }
            }
            // enable Tls12, if possible
            if (!ServicePointManager.SecurityProtocol.HasFlag((SecurityProtocolType)3072))
            {
                if (platformSupportsTls12)
                {
                    //Console.WriteLine("Platform supports Tls12, but it is not enabled. Enabling it now.");
                    ServicePointManager.SecurityProtocol |= (SecurityProtocolType)3072;
                }
             }

I am getting the below issue while getting smartObject.

Error getting case workflow - Exception: [System.Exception: GetSmartObjectData ---> System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Authentication failed because the remote party has closed the transport stream.
   at System.Net.TlsStream.EndWrite(IAsyncResult asyncResult)
   at System.Net.ConnectStream.WriteHeadersCallback(IAsyncResult ar)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
   --- End of inner exception stack trace ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()

Please help me on this if anyone faced the similar issue or any thing i am missing.