When listing an acid that has a SESSKEY value the SESSKEY does not show.
THE SESSKEY information is not tied to an acid. It is part of PSTKAPPL which is defined to the NDT and can be added to an acid.
When you enter a command such as the following, the PSTKAPPL data gets added to the acid and the SESSKEY data gets added to PSTKAPPL:
TSS ADD(acid) PSTKAPPL(pstkappl value) SESSKEY(sesskey value)
If you list the acid you will see the PSTKAPPL value.
In order to see the SESSKEY value associated with the PSTKAPPL value you need to issue:
TSS LIST(NDT) DATA(SESSKEY)