I use Communiteq (formerly DiscourseHosting) and their Adsense plugin — I do not know whether this factoid matters but I share it regardless.
Anyhoo, I have added my necessary publisher ID and slot unit ID’s and such in plugin settings, and also added my site and subdomain on Adsense under their Sites settings. However, I have received this error, see attached:
To add it to the head section, you can create a theme component. Note that the plugin is already going to load the adsbygoogle.js library for you, so once your site is verified by AdSense, you should remove this theme component!
Go to Admin > Customize > Themes > Components and click “Install”. Give it a name like “verify AdSense”.
I did this as you said. One concern: I have not placed it anywhere in my top-level domain — only in my subdomain. I had added that subdomain to Sites settings prior to this. It will still scan and accept that, right?
To summarize, I inserted that theme component, and Google came back saying “Ready” and units finally appeared and it seems functional. Then, I have deleted that theme component leaving only my plugin settings in place.
Not sure that will actually help since the crawler user won’t see the same topic list as the current user. I wouldn’t worry about that particular page.