All of my previous test have worked. I will test it right now.
Edit: Strange, it doesn't appear to be working on Ethernet to WiFi LANs on my network. (Could be related to how my network is set up) I'll check Ethernet to Ethernet. I'm looking into it. I've experienced some cases where certain types of network setups didn't show LAN games or took a long time for them to appear.
I'm looking into Advanced Sessions Plugin and the BP nodes. I'll hopefully have fix tomorrow. Very little has changed in 4.15-4.17 versions.
Edit 2: It works in editor. Looking into network related things.
Edit 3: Standalone works as well. Hmm, looking into possible packaged version configuration file problems.
Edit 4: Packaged LAN search and join works on the same PC when launching two instances. Going to try ethernet via switch LAN on two PCs.
Edit 5: It works on LAN network via wired on a local switch. It did not work on WiFi via WiFi Access Point to a wired client. I don't know why. It must have something to do with how Epic designed the sessions broadcasting over the network. My guess is that there's a broadcast packet that's being blocked by my access point.
Did you try LAN over wired networks? Or did you use WiFi?