Hi Henrik,
I tried with the advanced debugging and I have more information in the log (see below). I did try with different accounts but I just get extra info on impersonation. I also tried with different queues but I always get the same exceptions IF there are messages in the queue. If there are no messages in the queue, the job returns success and "Deleted 0 message(s)".
21/06/2017 14:39:51 Info Job started: Verwijder journal berichten
21/06/2017 14:39:51 Debug SendJobStats->Ended (21/06/2017 14:39:51)
21/06/2017 14:39:51 Debug Next action: ActionContinue
21/06/2017 14:39:51 Debug Calling GetNextTaskProcess()
21/06/2017 14:39:51 Debug Next Task is: MSMQ - verwijder alle journal messages van recodocs
21/06/2017 14:39:51 Debug Next action: ActionContinue
21/06/2017 14:39:51 Debug Calling StartTaskProcess() with Task: MSMQ - verwijder alle journal messages van recodocs (293353)
21/06/2017 14:39:51 Info Task started(MSMQ - Delete message(s)): MSMQ - verwijder alle journal messages van recodocs (293353)
21/06/2017 14:39:51 Info User 'VisualCron Default Admin' - Ran Job: Verwijder journal berichten
21/06/2017 14:39:51 Info Task completed (Failure)->'MSMQ - verwijder alle journal messages van recodocs' (293353)
21/06/2017 14:39:52 Debug PrevTaskProcess(MSMQ - verwijder alle journal messages van recodocs)->ExitCodeResult: Failure (ECCId: 746c95ce-d394-491c-925c-8bd50e4daa8ePId: 293353, Exit code: 77777)
21/06/2017 14:39:52 Debug Found 1 matching flows. (293353)
21/06/2017 14:39:52 Debug Next execution (2) for Job 'Verwijder journal berichten' is: 0:00:00
21/06/2017 14:39:52 Debug SendJobStats->Ended (21/06/2017 14:39:51)
21/06/2017 14:39:52 Err Job completed (Failure)->'Verwijder journal berichten'
And find the screenshot of the settings here: