The job already completed.
Release : 12.3
Component : ACTION BUILDER
Message box received: 4006529 of type W with inserts shown, message 'This task is not yet active or not active anymore.'.
Means that the job has already completed! So if you are trying to go into executions you will get this message.
If you go to where your job is defined and click on "Last Report" - it will advise the standard output from the job.