Multiplayer Setup help

With the 4.14 update, the “OnlineSubsystemSteam” plugin was added. Before 4.14, this used to be the only thing needed to get a multiplayer game working with Steam, but since the update I can’t figure out how to get both working simultaneously. Plugin disabled and .ini code in place the game works as intended but with no steam integration. Plugin enabled and .ini code out, I can’t create sessions. Plugin enabled and .ini code in place, the player is crashed out of maps with ?listen. ([edit] this only happens the first time a session is created. On the second attempt it seems to work.) Can someone explain what happened? I can’t find anything on the matter.