Following the steps below. I claimed my June Amazon Prime Gaming Rewards before my Bunige account was linked. Prime Gaming support says, "The loot was claimed successfully, but it's still pending fulfillment by the game". Error: "Sorry, we’re unable to deliver this content....". I double-checked my "Partner Rewards" on Bungie.net, and no June Prime Rewards showed either.
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I've linked my Amazon Prime and Bungie.net accounts, but am having trouble claiming my rewards in Destiny 2. What do I do?
If you claim your rewards via the Destiny 2 Prime Gaming website but do not see them with Master Rahool in the Tower, please visit your Bungie.net rewards history page to verify that they were applied to your account. If you do not see your rewards listed, visit the Destiny 2 Prime Gaming website to retry.
If you still don't see your rewards, please create a thread in our #Help Forum for assistance.
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I had the same problem for months. But the solution was quite weird. If you have any other items in the kiosk, claim them all out. If your problem is the same as mine, you'll see the newer stuff pop-up out of nowhere. Hope that works for you.