[TOnlineAsyncOpHandle](API\Plugins\OnlineServicesInterface\Online\TOnlineAsyncOpHandle)< [FModifyLobbyMemberAttributes](API\Plugins\OnlineServicesInterface\Online\FModifyLobbyMemberAttributes) > ModifyLobbyMemberAttributes ( [FModifyLobbyMemberAttributes::Params](API\Plugins\OnlineServicesInterface\Online\FModifyLobbyMemberAttributes\Params) && Params )