I also tried to AssociatedBundleIdentifiers in launchagent plist file, it does not work either by following https://developer.apple.com/documentation/servicemanagement/updating-helper-executables-from-earlier-versions-of-macos We tested on macos 15.

Our app is distributed directly. But I installed a lot of directly distributed mac app, they do display company name.

I did do this on clean mac, it is done on github CI, so it is clean mac for sure. https://github.com/rustdesk/rustdesk/blob/1d6037003a24664ac92f2cb390fb94f30468b3a2/.github/workflows/flutter-build.yml#L591 Do you mean the display name is related to notarization rather than signing?

Your support has change my personal to company name on app store of my ios App, but macOS still use the personal name.