Have you found a solution to this? I see the same problem, this worked 6 months ago and now has changed.
But they did not change the sample
ranfromraanana
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https://developer.apple.com/documentation/appstoreconnectapi/app_store/in-app_purchase/managing_in-app_purchases
Found the problem.
Should be
"type": "inAppPurchases"
instead of
"type": "inAppPurchasesV2"