[TFuture](API\Runtime\Core\Async\TFuture)< [TDefaultErrorResult](API\Plugins\OnlineServicesCommon\Online\TDefaultErrorResult)< [FLobbiesPromoteLobbyMemberImpl](API\Plugins\OnlineServicesEOSGS\Online\FLobbiesPromoteLobbyMemberImpl) > > PromoteLobbyMemberImpl ( [FLobbiesPromoteLobbyMemberImpl::Params](API\Plugins\OnlineServicesEOSGS\Online\FLobbiesPromoteLobbyMemberImpl\Params) && Params )