After assigning a new digital certificate in ACF2 for CICS, CICS receives the message 'FHPA1909 xxxxxxxx DATA INVALID FOR 'KEYRING'. RESPECIFY KEYWORD AND DATA OR BYPASS WITH '.END': 'xxxxxxxx'.
Release : ACF2 R16
Component : CA ACF2 for z/OS
According to IBM documentation for CICS Transaction Server section Building a key ring manually: The key ring must be associated with the CICS region user ID.
Also from IBM Support DFHPA1909 when attempting to use SSL:
Resolving The Problem
Change the Owner of the KEYRING Name to that of the CICS Region UserID as specified in Creating new certificates in the CICS information center.