I am developing a macOS app, with an embedded Finder Extension - https://developer.apple.com/documentation/findersync/fifindersync and I want the app and the extension to share UserDefaults - https://developer.apple.com/documentation/foundation/userdefaults
The App is Sandboxed for future distribution on the app store.
I followed instructions here : https://developer.apple.com/library/archive/documentation/General/Conceptual/ExtensibilityPG/ExtensionScenarios.html#//apple_ref/doc/uid/TP40014214-CH21-SW1
Both targets are part of the same app group, as it can be seen in the Entitlements:
<key>com.apple.security.app-sandbox</key>
<true/>
<key>com.apple.security.application-groups</key>
<array>
<string>$(TeamIdentifierPrefix)com.stormacq.mac.MyApp</string>
</array>
		<key>com.apple.security.files.user-selected.read-only</key>
		<true/>
	
2. I am accessing the UserDefaults by the suiteName :
	 let defaults = UserDefaults.init(suiteName: "TEAM_ID.com.stormacq.mac.MyApp")
	 //where TEAM_ID is the actual team id used to sign the app (something like 123AB45CDE)
	
However, when trying to read or write the defaults at App startup time, I receive this error message :
[User Defaults] Couldn't read values in CFPrefsPlistSource<0x600002c4d200> (Domain: TEAM_ID.com.stormacq.mac.MyApp, User: kCFPreferencesAnyUser, ByHost: Yes, Container: (null), Contents Need Refresh: Yes): Using kCFPreferencesAnyUser with a container is only allowed for System Containers, detaching from cfprefsd I found weird that the error message says Container: (null),.
The group container and the shared Preference file is created (and contains the correct default values set by my code) :
➜	~ ls -al ~/Library/Group\ Containers/TEAM_ID.com.stormacq.mac.MyApp/Library/Preferences/																						
total 8
drwx------	3 stormacq	1896053708	 96 Sep	6 19:58 .
drwx------	5 stormacq	1896053708	160 Sep	6 19:58 ..rw-------@ 1 stormacq	1896053708	103 Sep	6 19:58 TEAM_ID.com.stormacq.mac.MyApp.plist
I edited TEAM_ID to post this message
I am using Xcode 11.7 (Swift 5) and macOS 10.15.6. What did I miss ?
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