Как отправить форму с помощью Selenium на Java

Я использую Selenium WebDriver для автоматизации системы. Язык - Java. Я сделал большинство вещей, но застрял в одном месте. Мне нужно отправить форму, содержащую поля имени пользователя, пароля и повторного ввода пароля. Но когда я заполняю их (используя селен) и нажимаю кнопку «Создать учетную запись», это не сработало.

Here is the code,

    System.setProperty("webdriver.chrome.driver", "./ChromeDriver/chromedriver.exe");

    WebDriver driver = new ChromeDriver();
    driver.get("URL Here");

    WebElement element9 = driver.findElement(By.id("accountname"));
    element9.sendKeys(username);

    WebElement element10 = driver.findElement(By.id("password"));
    element10.sendKeys(password);

    WebElement element12 = driver.findElement(By.id("reenter_password"));
    element12.sendKeys(password);

I used these methods to submit the form. But none of them worked.

    element12.sendKeys(Keys.ENTER); //method 1

    WebElement element11 = driver.findElement(By.linkText("Complete Sign-up"));
    element11.click(); //method 2

    ((JavascriptExecutor)driver).executeScript("javascript:CompleteCreateAccount();"); //method 3

    WebElement element13 = driver.findElement(By.xpath("//a[@id='createAccountButton']/span"));
    element13.click(); //method 4

    element13.submit(); //method 5

    JavascriptExecutor executor = (JavascriptExecutor)driver;
    executor.executeScript("arguments[0].click();", element13); //method 6

Form HTML got from Inspect Element,

<div class = "leftcol">
<div id = "error_display" style = "display: none;"></div>
    <div class = "checkout_content_box" id = "cart_area">
        <form id = "create_account" name = "create_account" action = "" onsubmit = "CompleteCreateAccount(); return false; " method = "POST">
            <input type = "hidden" name = "lt" id = "lt" value = "0">
            <div id = "account_form_box">
                <div class = "join_form">
                    <div class = "form_row">
                        <div class = "form_area">
                            <label for = "accountname">Create a Steam account name</label>
                            <input type = "text" maxlength = "64" name = "accountname" id = "accountname" onchange = "CheckAccountNameAvailability();">
                        </div>
                        <div class = "form_notes">
                            <br>
                            <span class = "input_note"><a href = "javascript:CheckAccountNameAvailability();">Check availability</a></span>
                            <span id = "accountname_availability" style = "display: none;"></span>
                        </div>
                    <div style = "clear: left;"></div>
                </div>
                <div id = "form_row_choose_suggested_name" class = "form_row" style = "display: none;">
                    <div class = "form_area">
                        <label for = "choose_accountname">Available account names</label><br>
                        <select id = "choose_accountname" name = "choose_accountname" size = "3" onchange = "UpdateAccountName( this.value );">
                            <option id = "suggested_name_1"></option>
                            <option id = "suggested_name_2"></option>
                            <option id = "suggested_name_3"></option>
                        </select>
                    </div>
                    <div class = "form_notes">
                        <br>
                        <span class = "choose_accountname_description">Select one or try again with another name of your choice</span>
                    </div>
                    <div style = "clear: left;"></div>
                </div>
                <div class = "rule"></div>
                <div class = "form_row">
                    <div class = "form_area">
                        <label for = "password">Choose a password</label>
                        <input type = "password" maxlength = "64" name = "password" id = "password" onkeyup = "CheckPasswordStrength()" autocomplete = "off">
                    </div>
                    <div class = "form_notes">
                        <div id = "password_tag" class = "password_tag">&nbsp;</div>
                    </div>
                    <div style = "clear: left;"></div>
                </div>
                <div class = "form_row">
                    <div class = "form_area">
                        <label class = "reenter_row" for = "reenter_password">Re-enter password</label>
                        <input type = "password" maxlength = "64" name = "reenter_password" id = "reenter_password" onkeyup = "ReenterPasswordChange()" autocomplete = "off">
                    </div>
                    <div class = "form_notes">
                        <br>
                        <div id = "reenter_tag" class = "password_tag">&nbsp;</div>
                    </div>
                    <div style = "clear: left;"></div>
                </div>
                <div class = "rule"></div>

                <div class = "form_row">
                    <div id = "priv_and_sub">
                        <a id = "createAccountButton" class = "btnv6_blue_hoverfade btn_medium" href = "javascript:CompleteCreateAccount();" style = "float: right;">
                            <span>Complete Sign-up</span>
                        </a>

                        <div style = "clear: right;"></div>
                    </div>
                    <div id = "ssa_submit">
                    </div>
                </div>
            </div>
        </div>
    </form>
</div>

And also I need to say when I click Create Account button manually it is working. But using selenium It is not working and pass this message

The account name you have chosen is not available. Please choose another name. The password you entered is not allowed. Please select a different password, with at least 8 characters.

But username and passwords are okay. Nothing wrong. Because when I click it manually It is working with that username and password.