My app was rejected when review. Please help me if you known how to handle it.
I test in TestFlight App with sandbox, it is working well. But failed when reviewing by Apple with error : "An unknown error occurred" Sandbox server is not working sometimes, just write to Apple's Testers to test it again or send a new build (only with increased build number).
pjas
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I had the same problem with In-App Purchase on iOS 14 and sandbox environment:
Error Domain=SKErrorDomain Code=0 "An unknown error occurred" UserInfo={NSLocalizedDescription=An unknown error occurred, NSUnderlyingError=0x28385e520 {Error Domain=ASDErrorDomain Code=500 "Unhandled exception" UserInfo={NSUnderlyingError=0x28385c510 {Error Domain=AMSErrorDomain Code=100 "Authentication Failed" UserInfo={NSLocalizedFailureReason=The verify credentials call failed., NSLocalizedDescription=Authentication Failed, NSUnderlyingError=0x28385c3c0 {Error Domain=AMSErrorDomain Code=0 "Authentication Failed" UserInfo=0x282361940 (not displayed)}}}, NSLocalizedFailureReason=An unknown error occurred, NSLocalizedDescription=Unhandled exception}}}
Workaround:
Use Apple account with disabled two factor authentication.
P.S. If you cannot sign out because 'Sign out is not available due to restrictions' first turn off 'Screen Time'