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I am working on a billing implementation in UnityIAP. Recently, when I press the billing button on iOS, I get an Unknown error the first time, I checked the logs and found the following error. <SKPaymentQueue: 0x2823b65c0>: Error in remote proxy while processing transaction: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service named com.apple.storekitd" UserInfo={NSDebugDescription=connection to service named com.apple.storekitd}\ Special conditions, When this is occurring, addTransactionObserver is being called after the purchase order. If addTransactionObserver is called for a paymentQueue during the purchase process, would this error be called? Or if there is any problem on the AppleStore side, I would appreciate it if you could let me know. Thank you in advance.