Age verify by category / slug

Im trying to enable age verify for a specific. category and its products on our website, the category and slug is adult. I’ve set age gate to ‘selected content’ but can’t find anywhere in the settings to do specific categories or slugs?

I tried to go to the category and click the toggle icon for age verify but I still dont get any popup and the icon doesn’t seem to change color or show a lock/unlock icon, its always the same?