I have several notifications in my Adsense dashboard suggesting to enable "Related Search for Auto Ads" when I click the notification link it brings up a page that has information and several links to go to "Labs" and enable it. The links don't work unless you right-click and open in a new window which then takes you to Optimization / labs, however, there is nothing there at all about Related Search for Auto Ads - same if I go directly to Labs.

I know what the ads are and how they work and have seen them on several sites, my own included, occasionally. They look like a great replacement for the old link unit ads.

Has anyone managed to figure out how to enable them in the Adsense dashboard?