When running XCOM for Windows 11.6 on Windows Server 2012 in Core Modus (without Graphical User Interface) then start the XCOMD CA XCOM Scheduler service as follows:
Run the command net start xcomdsrv from the command prompt
Open Task Manager, Navigate to the Services tab and select xcomdsrv from the services list.
Right click on xcomdsrv and click on start to start the service.
These informations can also be found in Informational APAR RI79924.