I just tried submitting an app to be notarized. This app is actually only used by me internally (but I have other apps this question would be relevant to) and I can't submit for notarization. I get the following error:
"Hardened Runtime is not enabled."
Is the Hardened Runtime now required? I know it used to be optional (I believe the last time I submitted an app update a few months ago outside the Mac App Store I got no such error).