192.168.68.1/24 (192.168.1.0/24) should be 192.168.68.0/24 (or the ip address of your Roon server), assuming that your home router is using 192.168.68.1/24.
192.168.68.1/24 is the ip address of your home router, 192.168.68.0/24 is your network address. I don’t see the ip address of your Roon server mentioned. It should be somewhere in the 192.168.68.1-192.168.68.254 range, but not the same ip address as any other device in your network (i.e. 192.168.68.1, your home router).
This ufw rule allows tcp/udp ports outbound, but 55000/tcp should be inbound.
I think this has to be changed to:
ports=9003/udp|9100:9200/tcp|1900/udp|9330:9339/tcp|30000:30010/tcp|55000/tcp
But I’m no ufw expert. I suspect the [Roon] application profile settings in /etc/ufw/applications.d/roon don’t specify inbound/outbound.
I expect if you change this line to sudo ufw allow app roon tcp/udp ports will be opened inbound and outbound.