Thanks for the posts here. I've been scratching my head for the past week with the same thing on a project that had been working without issue for month but now also experiencing what's outlined above:
CKQuerySubscriptions fail to create with an error: "Invalid Arguments", server message = "attempting to create a subscription in a production container"
fetchAllSubscriptions comes back empty even if user previously had subscriptions
Manually altering a record of same type as subscription in the container dashboard temporarily restores ability to create and view subscriptions (~5 minute window mentioned above).
After that period, though it just stops working again
Have a ticket open with Apple but still waiting for a reply...
masonnosam
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FYI for those having this issue, I just got a reply to my TSI and was told this is a known issue that Apple is actively working on resolving. Hoping for a quick resolution!