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Tried your solution on a 3.1 system and the ACEE column was blank.
In z/OS 3.1, several of the SDSF panels (DA, AS, AD) support the JT action (display the Job Tasks panel, which shows every TCB in the address space.) That panel lists the address space ACEE as the ACEE for the first task, as well as the addresses of each task's ACEE (if applicable.)
The ACEE field supports point-and-click, so you can place the cursor on that ACEE address and it will display the associated memory. The M line command can be used to format the individual ACEE fields, including the user id.
This would be valuable if an STC creates a secondary ACEE to run under and alters the ASXBSENV to point to the secondary ACEE.
Fot STC's that are spawned and start under a general userid, then switch to a different userif for processing, this would be helpful. This would be the case if the ASXBSENV value is changed to point to a secondary ACEE.