An access denied error is thrown when expanding the results of a manual job run by a different user or a scheduled job that has not been shared with that user through a collection.
Known product defect TGAL-2872 (DE33866). Workflow results for scheduled runs should not show for other users, unless the schedules are shared with the user through a collection. As manual runs are not available to be shared through a collection, manual runs should only show for the specific user who runs the job.
Defect TGAL-2872 has been fixed starting from Server 2021.4. You can upgrade to Server 2021.4 and beyond.