Why can't I assign a value to the array in the class "Player"?

DataBridge: MonoBehaivor class

     data = new Player(SignupUsernameInput.text, SignupPasswordInput.text, Coins, highScore, racketsOwned[0] = RacketsOwned[0], backroundsOwned[0] = BackroundsOwned[0], ballsOwned[0] = BallsOwned[0]);
         
     data = new Player(SignupUsernameInput.text, SignupPasswordInput.text, Coins, highScore,racketsOwned[0] = "true", backroundsOwned[0] = "true", ballsOwned[0] = "true");

[Serializable] public class Player {

 public string Username;
 public string Password;
 public int Coins;
 public int highScore;
 public string[] RacketsOwned;
 public string[] BackroundsOwned;
 public string[] BallsOwned;

 public Player(string name, string pass, int coins, int HighScore, string[] racketsOwned, string[] backroundsOwned, string[] ballsOwned) {
     Username = name;
     Password = pass;
     Coins = coins;
     highScore = HighScore;
     for (int i = 0; i < racketsOwned.Length; i++)
     {
         RacketsOwned[i] = racketsOwned[i];
     }
     for (int i = 0; i < backroundsOwned.Length; i++)
     {
         BackroundsOwned[i] = backroundsOwned[i];
     }
     for (int i = 0; i < ballsOwned.Length; i++)
     {
         BallsOwned[i] = ballsOwned[i];
     }
 }

}