Updating Leaderboard from CloudScript

Hi i'm trying to update the leaderboard from a cloud script the problem is that it register the user correctly but it doesn't update the current score (Its a sum leaderboard)

This is my code from CloudScript

handlers.UpdateLeaderboard = function (args, context)
{
 var AddScore = UpdatePlayerScore(args.Leaderboardname, args.Playerscore);
 
    if (AddScore.leaderboardupdated == true)
       log.info("Statistics updated.");
    else
       log.info("Couldn't update statistics.");
  
    var resultleaderboard = server.GetLeaderboard(
        {
            PlayFabID: currentPlayerId,
            StatisticName : args.Leaderboardname,
            ProfileConstraints: {
                ShowDisplayName : true
            }
        });       
}
 
function UpdatePlayerScore(leaderboardname, score)
{
      var result = server.UpdatePlayerStatistics({
           PlayFabId: currentPlayerId,
           Statistics :[{ StatisticName : leaderboardname, Value : score }]
        });
        
       if (result.Error == null)
           return { leaderboardupdated: true };
       else
           return { leaderboardupdated: false };
}

And this is my current code in Unity

private void UpdatePlayerScore(string leaderboardname, string playerscore)
    {
        var result = new ExecuteCloudScriptRequest
        {
            FunctionName = "UpdateLeaderboard",
            FunctionParameter = new { Leaderboardname = leaderboardname, playerscore },
            GeneratePlayStreamEvent = true
        };


        PlayFabClientAPI.ExecuteCloudScript(result, OnLogginSuccess, OnErrorSuccess);
    }