GKScore unable to update Game Center

Question

iOS 12.x Swift 4.2

Trying to update the GKScore using GameKit, but it failed with the error message, "error failed to update nil". The record I am trying to write as an authenticated user looks like this. I don't see any nil values.

ScoreReporter player:playerID:G:1572714306 alias:2004 friendLevel:FL6 rank:0 date:2018-12-21 14:15:32 +0000 value:400 formattedValue:(null) context:0x0 leaderboard:highScore group:(null)

The code it is running...

if GKLocalPlayer.local.isAuthenticated {
        var scoreReporter = GKScore(leaderboardIdentifier: "highScore")
        scoreReporter.value = Int64(scoreToSave)
        print("ScoreReporter \(scoreReporter)")
        var scoreArray: [GKScore] = [scoreReporter]
        GKScore.report(scoreArray) { (error) in
            print("error failed to update \(error?.localizedDescription)")
        }

Tried deleting and recreating highScore ID, but not helping... also tried deleting app on iPad, no working either.

When I go to Game Center, it reports "No Data Available"