Hey Rob,
I have managed to successfully notarize my Mac game to comply with OSX Catalina requirements. Unfortunately, after doing it, Steam sdk does not start anymore. When running the same exported build before notarizing Steam starts, after it doesn't. Do you have any idea why this happens?
I guess it may have something to do with Steamwrap not having "hardened runtime" enabled (app was initially rejected during notarization process for this reason) so I had to force it when signing.
Any idea? Thank you.