The following error displayed during the execution of SSID0001 of the post install:
IKJ56893I DATA SET TSOTS.ASYSADM.PTDB.TID589.Z501.RDATA NOT
ALLOCATED+
IGD308I DATA SET ALLOCATION REQUEST FAILED -
RACF FUNCTION: RACDEF FOR
DATA SET: TSOTS.ASYSADM.PTDB.TID589.Z501.RDATA WITH RETURN
Release : 20.0
Component : General Services for DB2
The executing User ID didn't have Create Access to create the dataset. Changing user ID to the one with the correct authority to create in the CDBASAMP(SSIDDDL) resolved the problem. Also removing USER=ASYSADM from the job card.