The following error displayed during the execution of SSID0001 of the post install:
IKJ56893I DATA SET XXXXX.XXXXXXX.XXXX.XXXXXX.XXXX.XXXX NOT
ALLOCATED+
IGD308I DATA SET ALLOCATION REQUEST FAILED -
RACF FUNCTION: RACDEF FOR
DATA SET: XXXXX.XXXXXXX.XXXX.XXXXXX.XXXX.XXXX 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=XXXXXX from the job card.