User needs an eQL to download a full list of the Subscriptions, where the subscriptions have been assigned.
The below eQL will help resolve users issue:
START WITH Document SELECT Id, Code Number, Revision, State, DISPLAY_NAME(ApprovalStatus) Status, Attributes["CAS", "CAS Department"].Value Department, Subscriptions.Subscriber.Object.Id SubscriberId, Subscriptions.Subscriber.Object.Label Subscriber, Subscriptions.Subscriber.DeliveryAddress Email WHERE IsTemplate = 'N' AND Subscriptions.Subscriber.Object.Id IS NOT NULL