After RSU2104 maintenance was applied, the following message was displayed when trying to access RC/QUERY, SA and DT: RC=008, RCODE=0052 USER XXXXXXXX IS NOT AUTHORIZED TO EXECUTE PLAN:RQPAPLCA
Release : 20.0
Component : CA RC/Query for DB2 for z/OS
A corrupted authorization module was the cause of the problem. Rebuilding it resolved the problem.