Job Approval is an option which it just notifies, that it is disabled. Like other options, ie Email Notification, Parallel Execution, Job Password etc.
Job approval is an option where help desk users after creating any job need to wait for execution of job till a user with Approver priviliedge has not approved the job.
The Failure may have some other underlying problem, like incorrect credentials etc. On fail device you should check the failure reason.
-Thanks
Vinod
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