Hi,
There is not really an "owner" of a job, but the user who last modified the job is stored, and that user name and their authorization roles are used when the scheduled job is executed so that the execution has only the permissions granted to that user.
If you specifically grant authorization by username in aclpolicy files, and later remove those authorizations, you could be have the state where the scheduled job would fail due to lack of authorization. Granting authorization via roles should not have that problem.
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Greg Schueler