Hi,
So, first of all, I would recommend to get the Block first, then the allowed categories.
Now, try to run a test from an machine, to an Website using HTTP, and in FWL logs, you should see a Firewall log and then an Redirect log ; since the site is Blocked.
If all good with HTTP, try with and HTTPS and in FWL logs, you should see the same, an Firewall log, then an Inspection log and then an Redirect log.
Ty,
PS: can you show a screenshot of the browser error - with address-bar included.
Maybe it's saying that it can't reach the portal you redirected to ....