The application seems to be signed and notarized correctly, my assumption is that there was some record of a development build using the same app identifiers (like I said, no issues when running a development build)
To answer your questions:
The FileProvider does have the Sandbox capability
I am using a Distribution provisioning profile
I can confirm the signing certificates are still valid
Yes, the main application is within the same App Bundle as the File provider extension
claucambra
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The issue is not with accessing files via the URL received from NSFileProviderManager getUserVisibleURL(for itemIdentifier: ) , the issue is that the call to getUserVisibleURL itself throws the error "The file “...” couldn’t be opened because you don’t have permission to view it." I have no URL to start accessing with a security scope.