It’s not as simple as just restarting with the ?listen option
You have to setup some things in via the Game Mode and a GameSession
Check out how shooter game does it!
In particular check out the GameSession class 
's the most important function:
bool AVictoryGameSession::HostSession(int32 ControllerId, FName SessionName, const FString & GameType, bool bIsLAN, bool bIsPresence, int32 MaxNumPlayers)
{
//...