Error: 'The remote server returned an error: (401) Unauthorized' error is seen while running an automation job

Error: 'The remote server returned an error: (401) Unauthorized' error is seen while running an automation job

While running an TIBCO Spotfire Automation service job from the command line(Automation ClientJobSender) or Windows task Scheduler, the following error can be seen in the 'Spotfire.Dxp.Automation.ClientJobSender.exe.log'.

System.Net.WebException: The remote server returned an error: (401) Unauthorized.
   at System.Net.HttpWebRequest.GetResponse()
   at Spotfire.Dxp.Worker.ServiceContracts.Automation.ExecutionStatus.Create(WebRequest request)
   at Spotfire.Dxp.Automation.ClientJobSender.ServerConnectionManager.ExecuteWithOAuth2Retry(Func`1 executer, Boolean isRetry)
   at Spotfire.Dxp.Automation.ClientJobSender.JobExecutionHandler.ExecuteServiceCall(ServerConnectionManager connectionManager, Func`1 executer)
   at Spotfire.Dxp.Automation.ClientJobSender.JobExecutionHandler.Run(CommandLineManager cmd)

  Make sure that the user account mentioned in the "Spotfire.Dxp.Automation.ClientJobSender.exe.config" file, which is used to run the automation job is able to log in to Spotfire.

Doc: Installing the Client Job Sender

• https://docs.tibco.com/pub/spotfire_server/10.3.0/doc/html/TIB_sfire_autsvcs_10.3.0_UserGuide/GUID-4AA5222D-3EF1-4700-A28B-0120A5B9E42F.html

Doc: Running the Client Job Sender

• https://docs.tibco.com/pub/spotfire_server/10.3.0/doc/html/TIB_sfire_autsvcs_10.3.0_UserGuide/GUID-58FCBE3C-4524-4B77-963C-A9BC4EB7F5C4.html