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Like I mentioned in my original post, the binaries are compiled as 32-bit/64-bit fat binaries (i.e. the built binary contains executable code for both architectures). It runs fine on macOS 10.15 and also runs fine going as far back as Mac OS X 10.6.

> what do you expect from this notarization which is not using the built product ?I'm not sure what you mean. The 32-bit/64-bit binaries are built and signed using Xcode 9, and then packaged into a .dmg file, and then the altool and the stapler tool (from Xcode 10) are used to notarize that .dmg file.This guide here implies that having multiple versions of Xcode is supported but that only Xcode 10 or later can be used for notarization: https://developer.apple.com/documentation/security/notarizing_your_app_before_distribution/customizing_the_notarization_workflow?language=objc