Unable to notarize Electron-based application. All notarization attempts fail with "The signature of the binary is invalid" for main executable and Electron Framework, despite passing local codesign verification. ENVIRONMENT: macOS: 24.6.0 (Sequoia) Hardware: Apple M4 Max (arm64) electron-builder: 26.0.12 Electron: 36.9.5 (also tested 37.10.2, 38.2.0) Certificate: Developer ID Application: AS LIVE MEDIA SP Z O O Team ID: 2KJ532SU3G Certificate validity: Oct 7 2025 - Oct 8 2030 PROBLEM: Every notarization submission fails with identical error for two binaries: Contents/MacOS/PresentClic Desktop Contents/Frameworks/Electron Framework.framework/Versions/A/Electron Framework Error message: "The signature of the binary is invalid." Architectures affected: Both x86_64 and arm64 CRITICAL CONTRADICTION: ✅ Local verification PASSES: $ codesign --verify --deep --strict "PresentClic Desktop.app" Result: valid on disk, satisfies Designated Requirement ❌ Apple notarization service FAILS: Error: "The signature of the binary is invalid" LATEST SUBMISSION ID: 11e1a452-4ea7-4562-ac8e-5e76c39eeb6c Local verification output shows all components validated: Electron Framework: validated ✅ All helper apps: validated ✅ All frameworks: validated ✅ Main executable: valid on disk ✅ Authority chain: Developer ID Application → Developer ID CA → Apple Root CA ✅ Timestamp: Present ✅ Runtime Version: 15.4.0 ✅ CONFIGURATION: Entitlements (build/entitlements.mac.plist): com.apple.security.cs.allow-jit: true com.apple.security.cs.allow-unsigned-executable-memory: true com.apple.security.cs.disable-library-validation: true com.apple.security.cs.allow-dyld-environment-variables: true com.apple.security.automation.apple-events: true Standard device/network/file entitlements Build configuration: hardenedRuntime: true gatekeeperAssess: false (tested both true and false) entitlements and entitlementsInherit: properly configured TROUBLESHOOTING STEPS ATTEMPTED (ALL FAILED): ✅ Updated electron-builder from 24.13.3 to 26.0.12 ✅ Downgraded Electron 38 → 37 → 36 ✅ Tested x86_64 and arm64 separately ✅ Regenerated certificate via Xcode (new cert generated 23/11/2025) ✅ Configured App Store Connect API for notarization ✅ Tested multiple entitlements combinations ✅ Manual component-by-component re-signing ✅ Removed all metadata files (._ files) ✅ Tested both ZIP and DMG formats ✅ Automatic electron-builder notarization ✅ Manual notarization via xcrun notarytool ✅ Custom afterSign hooks for re-signing ✅ gatekeeperAssess true and false ✅ Clean builds (removed dist/ directory) ALL attempts result in identical failure. Local codesign verification ALWAYS passes. QUESTIONS: Why does local codesign --verify pass but Apple notarization service fails? Is there a known issue with Electron Framework notarization on macOS Sequoia + Apple Silicon? 3. Are there undocumented requirements for Electron apps that could cause this? 4. Could this be a bug in the notarization service for this specific configuration? ADDITIONAL CONTEXT: Multiple notarization attempts over 24+ hours Different certificates, configurations, architectures - all fail identically No similar reports found in forums or GitHub issues Application functions correctly when Gatekeeper is bypassed This is blocking production distribution to macOS users This appears to be either: A bug in Apple notarization service for Electron apps An incompatibility between electron-builder 26 + Electron 36/37 + macOS Sequoia + Apple Silicon The fact that local verification passes but notarization fails suggests the issue is with the notarization service validation logic, not the actual code signatures. REQUEST: Need guidance on resolving this issue. Standard documentation and troubleshooting steps have not resolved the problem. Thank you for any assistance. Staszek Pliszko