You must use one of the following methods to register the user SVC:
Static registration using the IEASVCxx parmlib member
Dynamic registration using the YKALCSVC command
If you use the IEASVCxx parmlib member to perform registration, you must reload the system (that is, perform an initial program load (IPL)). If you cannot perform a re-IPL while the system is running, use the YKALCSVC command to perform registration.