I solved the problem.
Systems above iOS 18.2 need to call the purchase(confirmIn:options:) interface and pass a confirmIn parameter.
See https://developer.apple.com/documentation/storekit/product/purchase(options:)#Discussion
zbjumper
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same error in iOS 18.2(22C150).
I encountered the same error in iOS 18.2(22C5142a).
I have the same issue and I still haven't found a solution too