After reading this thread, sounds like you didn't get it to work. I kind of misread it, and got it to work. We have no layer 3 rules, just layer 7 to block multiple countries. I wanted access to one website in one of those countries. I created a Group Policy just for my computers IP, then created a duplicate layer 7 to block the same countries and verified I did not have access. Then I created a layer 3 Allow rule. I tried to use TCP and the FQDN, but it didn't work. Turns out I need to use the websites actual IP address, and it works fine. We are using an MX64, completely updated. Hope this helps if you never got it to work.
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