SINCE APPLYING ENFCICS APAR RO91406, CTS 5.4 STARTUP ABENDS WITH SYSTEM COMPLETION CODE=23E.
There is no evidence of CA-ACF2 initializing (PHASE) messages.
Answer:
CICS TS 5.4 compatibility requires maintenance be applied to both ENFCICS and ACF2.
Although the ENFCICS apar RO91406 was applied, the required ACF2 r16 maintenance, RO96890, was not.