Thanks for checking!
Interestingly, I don't see the "IRC Access" section at all. Just the other options.
The problem must have been on my end. I tried IRC again, and this time, it worked!
It turns out I was trying to use the irc.ipv6.he.net server, 2001:470:0:6667::2 and it appears to be down. Changed to another IPv6 IRC server, and that's just fine.
There is no more IRC server on our network, so if you specified an IP it won't work.