I have looked at trying different signing options. I am using Automatic and tested Apple Developer, Developer, and Developer ID - Application, which we use in command line signing and notarization.

Thank you, The exported archive has the full app that you can run. It is not a dependent target. Exporting the archive I can double-click on the app, it is complete and runs fine. This used to work, what could have changed? How can I tell Xcode to treat this as an app?

BTW, the Distribute App vs Content is a very good lead I will investigate further.

Resolved. You are correct. Any additional content apart from the app will make Xcode treat it as content. I followed through and the directory contained a lock file used as a workaround for the inability to have a custom script for the Clean Product option. Since we use Qt integrated into the project, cleaning requires some extra directories to be cleaned up. I moved that function to a prebuild script that was triggered by the absence of a lock file in the project. Removing it and just testing for the App Bundle shell resolved the issue. We can now use Developer ID/Notarization or App Store submission from the Organizer. Thanks for your help.

BTW, I figured out the lock file issue waking from a dream in the middle of the night, but your second response would have led me to it without that sudden enlightenment.