EQA9966E Back-level z/OS® Debugger SVC detected. V5R1 or later SVCs required for Non-LE support.

Explanation
z/OS Debugger is unable to initialize for a
non-Language Environment® assembler program under CICS® due to back-level z/OS Debugger SVCs.

Programmer response
Verify that the latest version of the z/OS Debugger SVCs are installed. The level of the SVCs can be checked by running the exec in
hlq.SEQAEXEC(EQADTSVC).