Register user doesnt work (MySQL)

private static string connectionString = "";


static void Main(string[] args)
{
    Console.WriteLine("Press 1 to Login or 2 to Register:");
    var choice = Console.ReadLine();

    switch (choice)
    {
        case "1":
            Login();
            break;
        case "2":
            Register();
            break;
        default:
            Console.WriteLine("Invalid choice");
            break;
    }
}

static void Register()
{
    Console.Write("Enter username: ");
    string username = Console.ReadLine();
    Console.Write("Enter password: ");
    string password = Console.ReadLine();
    string hashedPassword = BCrypt.Net.BCrypt.HashPassword(password);

    using (var connection = new MySqlConnection(connectionString))
    {
        connection.Open();
        var command = new MySqlCommand("INSERT INTO login (user, password) VALUES (@user, @password)", connection);
        command.Parameters.AddWithValue("@user", username);
        command.Parameters.AddWithValue("@password", hashedPassword);

        try
        {
            command.ExecuteNonQuery();
            Console.WriteLine("User registered successfully!");
        }
        catch (MySqlException ex) when (ex.Number == 1062)
        {
            Console.WriteLine("Username already exists!");
        }
    }
}