I'm trying to sign and notarise my OSX application. The Apple developer documentation says to do xcrun notarytool .... per https://developer.apple.com/documentation/security/notarizing_macos_software_before_distribution/customizing_the_notarization_workflow
But when I try this, I get an error xcrun: error: unable to find utility "notarytool", not a developer tool or in PATH.
The apple documentation simple says 'install Xcode 13 beta' and you'll have it. Well, I have Xcode 13 installed on MacOS 11.6, do I have to downgrade to the beta? reinstall? look for it somewhere? inside Xcode.app?