Sounds like the faq could use some work.
Something like non-claimable keys are not mentioned there. Explanation of such a use case is what I would expect from the faq, as it is bound to create confusion.
If it previously worked, maybe the key was flagged for "supicous" behaviour...
The faq is not very clear if keys are supposed to be share-able. What with the bulk keys, it rather reads like they are not share-able and the dev can even manually revoke them, if used for downloading too often.