A few weeks ago we encountered a problem with downloading on-demand resources on the test flight.
We've noticed that this problem is discussed at Apple Developers Forum, and users replied that there was a problem with tags on testflight server.
https://forums.developer.apple.com/thread/129821
when this issue was resolved, we got a request to resubmit a new version, which we did. After that, an error with on-demand content disappeared / was solve on the version which was in Testflight.
Loading of On Demand Resources was tested on different devices by many testers through the testflight - the application works perfectly, but the reviewer still gets an error.
But apparently this error remained in the version which is being reviewed by your team.
Pls check the matter of errors related to tags and on your production server?
many thanks