Hey Vic, this is what I did, maybe it will help you...
First, I tested using LAN IP of the server (same as my UnRAID) - I was connected to the same LAN.
Then, I've set a NAT on my firewall - also pfSense - for all the ports described in the docs (see below with my UnRAID LAN IP masked)
Finally, I've set a DNS record so I could use it instead of my public IP.
I know this is basic, but make sure your UnRAID server can actually access the internet trough your firewall.
If still not working, maybe logs and error msgs may help indicate the problem.
Good luck!