Has anyone seen this error before when trying to buy units

Unable to buy units. Literally haven’t changed my device, Apple login or payment info. Yet I’m given this error all of a sudden… Says I can’t post media so I’ll quote the error message, “In-app purchase is not supported. Machine licensed app does not support in-app purchases” then after this box fades another one appears with this message, “Transaction incomplete - the operation couldn’t be completed. (SKErrorDomainerror 0)
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That said, I would still try their Support first, since they might have an easier time looking into that particular issue.