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I found that it is not invalid for app group while it create the file in /private/var/root/Library/. And the container app create the file in /Users/***/Library/Group Containers/. How to set they using the same directory? By running the app in root way or I can set some parameters in systemExtension. Any help or advice is appreciate. Thanks in advanced.

I met the same problem. Finally I found that I use the networkExtension capacity to build a developer id app(already notorized by Apple).My app crash immediately and I get "Code Signing error"(Details in console is "Code has restricted entitlements, but the validation of its code signature failed. Unsatisfied Entitlements:").I think this is because capacity supporteed by develop id is limited(see https://help.apple.com/developer-account/#/devadf555df9). And network extension is not possible used in a developer id app (see https://forums.developer.apple.com/thread/67613).