I'm working on an app using location data and external Restful API(Openweather API). The problem is my application seems not working properly on the app store reviewer's environment. It's continuously rejected with the reason Guideline 2.1 - Performance - App Completeness. It's very weird because on the local environment using Xcode simulator and real devices I have, it doesn't cause any problems that app store mentioned. I guessed it would be network issue, so started to delete functions related to network communication one by one and then submitted the app. My app finally accepted after deleted all of the functions. Even there is native swift function like reverseGeocodeLocation. Isn't native swift function compatible to IPv6 or any Apple's network security policies? I still don't know which part is problem. Did I miss something?