The "Full Disk Access" authorization exists to facilitate the sort of thing you're describing. It disable the user privacy protection that's blocking access above. You can find the Full Disk Access setting in "System Settings > Privacy & Security > Privacy".
If I configure a LaunchDaemon using “SMAppService”, will the LaunchDaemon also share the “Full Disk Access” permission of the main app?
LaunchDaemon's should remain embedded inside their parent app bundle and managed through "SMAppService".
"SMAppService" is supported only on macOS 13 and later. If I configure a LaunchDaemon using a plist on earlier macOS versions, can it still use the “Full Disk Access” permission?
jh1128
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