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The Mac App Store requires App Sandbox, which the macOS app didn't declare. App Sandbox is macOS-only (invalid on iOS/tvOS, fails upload validation), so the macOS target now uses a dedicated Config/Punktfunk-macOS.entitlements while iOS/tvOS keep the shared Config/Punktfunk.entitlements (unchanged). The single macOS app is sandboxed for BOTH channels — the Developer ID DMG is codesigned with the same file — so the local build equals what App Store users get. Entitlement set (verified against the code + Apple docs): - app-sandbox, network.client. - network.server: NOT optional despite the client being outbound-only — the sandbox gates the bind() syscall as network-bind, and quinn (quic.rs) + the raw-UDP plane (transport/udp.rs) both bind explicitly, so host->client datagrams never arrive without it (the classic QUIC-under-sandbox trap). - device.audio-input (mic uplink), device.bluetooth + device.usb (Xbox/DualSense controllers over BT/USB via GameController), keychain-access-groups (existing). Omitted: device.hid (undocumented), files.user-selected.* (no pickers), networking.multicast (Bonjour browse is exempt; requesting it breaks signing). CI (release.yml): add a macOS App Store archive+upload-to-TestFlight step mirroring the iOS lane (manual Apple Distribution signing + the 'Punktfunk macOS App Store Distribution' profile, app-store-connect/upload, installer-signed pkg), continue-on-error until the portal prereqs exist; point the Developer ID DMG codesign at the sandboxed entitlements. Docs (ci.md) + clients/apple README updated; the runner additionally needs the macOS platform on the App Store Connect record + the '3rd Party Mac Developer Installer' cert. Verified: signed Debug build embeds exactly the intended entitlements (codesign -d --entitlements), swift build green against the rebuilt xcframework. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>