Update: Resolved The issue was the DMG format. electron-builder on Apple Silicon creates APFS DMGs by default, and Apple's notary service has a known issue with APFS DMGs (Apple DTS: r. 134264492). APFS DMG → stuck "In Progress" forever HFS+ DMG → Accepted in 2 minutes Fix: create the DMG manually with HFS+ instead of letting electron-builder create it with APFS. hdiutil create -size 500m -fs HFS+ -volname "MyApp" /tmp/temp.dmg hdiutil attach /tmp/temp.dmg -readwrite cp -R "MyApp.app" "/Volumes/MyApp/" ln -s /Applications "/Volumes/MyApp/Applications" hdiutil detach "/Volumes/MyApp" hdiutil convert /tmp/temp.dmg -format UDZO -o MyApp.dmg xcrun notarytool submit MyApp.dmg --keychain-profile "profile" --wait xcrun stapler staple MyApp.dmg