Do CUGs work on Author instance?
https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/cug-doesn-t-work-on-restricting-permissions-for-a-specific-page/m-p/575270#M143789
I'm trying to work this out, but this doesn't work when I tried on my author instance.
I followed these steps pointed here.
Let me know if there are any other options to get this work.