HELP!!! Problem with OnlineSubsystem

Hi everyone, I need a help for my project, I’m creating a game that allows players to enter multiple sessions created and managed by a dedicated server, but I have a problem. I am using the “Advanced Sessions” plugin and thanks to this it allows me to manage multiple sessions created on the same server, so players can be assigned to the selected sessions. The problem is that all this works only in LAN "[OnlineSubsystem]
DefaultPlatformService = Null ", there is a way to tell the client that when it looks for a session it must pass over the network (with a public IP).
I am attaching the image to understand better.

P.S: I can not use Open Level (with ip) because I can not manage all the multiple sessions and the functions created.