NF not blocking sites when accessed via link on another site

I have my son's school work computer setup to block basically everything except google.  All categories are checked and I have specifically black listed sites like youtube.com.  On his machine, if I type youtube.com into the address bar, the site is blocked.  However, if I go to google, search for "youtube", and click the link provided from google, the site is not blocked.  I have tested this with both Chrome and Edge browsers.  Both have the same issue.

I need a resolution to this issue, or I will be forced to ask for a refund and find another app which can actually handle this basic issue.

NF v 3.4.0.45 (Framework & Datastore v 6.5.0.14), running on Windows 10.

Thanks,

davesaus