The internal zone should have mdns enabled by default. Did you check that the network interface is assigned to that zone?
firewall-cmd --list-all-zones
Is the network printer found using these commands?
lpinfo -v
avahi-browse -at
The internal zone should have mdns enabled by default. Did you check that the network interface is assigned to that zone?
firewall-cmd --list-all-zones
Is the network printer found using these commands?
lpinfo -v
avahi-browse -at