I hope this finds you guys well and helps you along the way
Place this in your project/plugins folder along side advanced sessions 4.27 locked.
Use the create advanced sessions and find advanced sessions nodes with “use lobbies if available bool” apply the SystemSeetings for net.AllowClientREmapCacheObject=1 and net.FilterGuidREmapping=0 if your using seamless server travel to avoid netGuid desync errors.
Not necessary because unreal header will build the plugins for you but if you haven’t setup visual studio and c++ prereqs here is a video to help with that too.
Happy Developing