Same USG here. If you're on two different networks in the Unifi setup you'll also probably need a firewall rule between them. In my case the 10.0.0.0/24 was on

Same USG here. If you're on two different networks in the Unifi setup you'll also probably need a firewall rule between them. In my case the 10.0.0.0/24 was on pfSense so the Unifi router just passed it along and didn't do anything else.