The application is built with Electron. After building, I sign the .app bundle with my Developer ID and then notarize it using xcrun notarytool submit. The notarization returns as Accepted, and I then package the signed .app into a .dmg. When testing the resulting .dmg on another Mac that is also signed into my developer account, everything works correctly — the app launches without issues. I suspect this could be related to intermediate certificates not being correctly embedded or trusted on machines outside my development environment.