This appears to have been introduced when the containing folder was changed from the app's sandbox folder into the App Group's folder. Whenever you try to delete a certificate, it fails with:
Error Domain=NSCocoaErrorDomain Code=513 "(#file) couldn’t be removed because you don’t have permission to access it."
This appears to have been introduced when the containing folder was changed from the app's sandbox folder into the App Group's folder. Whenever you try to delete a certificate, it fails with: