Same here, I am going nuts. A whole day seeing the error, resetting everything and nothing new. Thank for this post, at least I am not alone. Mac Sandbox environment has always been terrible with invalid receipts or insanely long merged ones, but this time the deserve a trophy. Hope they fix it soon, I can't update my app for Mac due to it.

Dear @eskimo, could you, please, provide us any support for this issue? I've been doing the same process for the same app for 9 years, same build, sandbox in-app, etc, etc. Now, without changing anything, I am completely blocked with the error described in this thread. I've tried just everything possible, from new certificates, cancelling and recreating all certificates, etc, etc. But nothing, the app closes during startup, log shows: Error fetching receipt for xxxx - Error Domain=com.apple.commerce.client Code=500 “(null)” ‘The operation couldn’t be completed. (com.apple.commerce.client error 500.)’ Then the nightmare message App is damaged ... Instead of relaunching the app asking for the sandbox account login as have always happened. On this thread and a few others, you can see that there are many developers facing the same situation without any alternatives. Thanks in advance, Fernando

And the nightmare continues, I've tried new MacOS, updated XCode, everything, same issue. Here a more detailed log from Console, everything points to a problematic AppStore sandbox receipt server: default 14:57:06.387845+0100 storeuid <StoreKitClient: 0x7fa18b242600>: Initializing client from bundle URL: file:///Users/victor/TPBuilds/BuildMac/XXX.app/ default 14:57:06.399105+0100 storeuid <StoreKitClient: 0x7fa18b242600>: Using active account. Sandbox: 1, receipt exists: NO, receipt is stub: NO default 14:57:06.400569+0100 commerce storeuid[1335] starting request app-receipt-create default 14:57:06.579773+0100 commerce <CKStoreRequest: 0x7f8dc1d67830> https://p100-sandbox.itunes.apple.com/WebObjects/MZFinance.woa/wa/createAppReceipt default 14:57:07.285964+0100 commerce StoreSession: StatusCode: 200; ; Environment: SB-MR; URL: https://p100-sandbox.itunes.apple.com/WebObjects/MZFinance.woa/wa/createAppReceipt error 14:57:07.291059+0100 storeuid <ReceiptRefreshRequest: 0x7fa189416420>: No receipt data in response error 14:57:07.291232+0100 storeuid <ReceiptRefreshRequest: 0x7fa189416420>: Error fetching receipt for com.xxx.yyyy - Error Domain=com.apple.commerce.client Code=500 "(null)"