A few new errors popped up on the backgrounders non-extract tasks:
1. Subcription failures - this error relates to the user not having permissions to this view. Maybe at one time, the user did have permissions, and in old versions, the subscriptions ran fine, but now they fail. Resolution is to either grant the user permission to the workbook, or delete their subscription altogether.
2. Warmup of cache failures - this error relates to the owner of the workbook being unlicensed and therefore does not have render privileges. Resolution is to reassign the owner.