It seems that re-querying my inventory after a successful Amazon purchase does NOT return a 'true' for the item being owned. Amazon App testing denied my app. The purchase was able to go through, but when you go to receive your blocked content, you just get prompted to purchase again.

When you try to purchase AGAIN, the purchase fails. I'm assuming Amazon's servers registered the purchase and won't let you re-subscribe. Like I said though, querying the inventory immediately after the first purchase did not show the SKU as purchased.

Everything is working fine in Google Play, so I'm not sure what to do.