bool PromoteMember ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & LocalUserId, const [FOnlinePartyId](API\Plugins\OnlineSubsystem\FOnlinePartyId) & PartyId, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & TargetMemberId, const [FOnPromotePartyMemberComplete](API\Plugins\OnlineSubsystem\Interfaces\FOnPromotePartyMemberComplete) & Delegate )