Game Center Badge Not Removed After Game Ends

In my GKTurnBasedMatch, if a player quits the turn is then passed onto the second player. As this is only a two player game, I automatically make them win upon receiving the notification.

But for some reason, the App Icon badge is still showing 1 notification? I'm not sure why this hasn't dismissed?

Here's what I run when the notification of the other player quit comes through:

func CheckForWin (matchToCheck: GKTurnBasedMatch) {
        
        for opponent in matchToCheck.participants {
            if opponent.matchOutcome == .quit {
                
                matchToCheck.currentParticipant?.matchOutcome = .won
                matchToCheck.endMatchInTurn(withMatch: Data()) { (error) in
                    
                    // All Done, load the matches again...
                }
            }
        }
        
    }