PHP Cookie is not set on remote server

I implemented a cookie that works on the local server but does not work on the remote server, I do not understand why. Thanks for any help. I have the following code:

<?php


            if (isset($_POST['name']) && !empty($_POST['name'])) {
                $firstName = ucwords($_POST['name']);
                setcookie('Cookie', $firstName, time() + 60 * 60 * 24 * 30);

                insertData($firstName);
                $last = mysqli_insert_id($db);

                ?>
<h1>Hello, <?php echo $firstName; ?>! How are you?</h1>
<form action="" method="POST">
                            <input id="email" name="email" type="text" value='' autofocus="autofocus">
                            <input name="id" type="hidden" value="<?php echo $last; ?>">
                            <input name="name2" type="hidden" value="<?php echo $firstName; ?>">
                            <button name='submit2' type="submit"></button>
                        </form>

<?php
}



else if (isset($_POST['submit2'])) {
            $mail = $_POST['email'];
            $last = $_POST['id'];
            $firstName = $_POST['name2'];
            updateData($mail, $last);

            ?>
<h1>Awesome, <?php echo $firstName; ?>. I’ll keep you updated.</h1>

<?php }




else if (isset($_COOKIE['Cookie'])) { ?>
<h1>Hi, <?php echo $_COOKIE['Cookie']; ?>. Welcome back.</h1>


<?php }




else { ?>
<h1>Hello, my name is Lisa.</h1>
<form id="form1" action="" method="POST">
                        <input id="name" name="name" type="text" autocomplete="off" autofocus="autofocus">
                        <button id="button1" type="submit"></button>
                    </form>

<?php } ?>