Integration in WP comment form

The integration in the WP comments does not work!
My website is: https://www.kk4you.de
The form is integrated as described in the document “Add Mailchimp interest choice to WP comment form”
https://www.mc4wp.com/kb/add-interest-group-choice-comment-form/

However, the email is not entered in the audience
The registration via widget works

The following code was added to the function.php

// V1.1  Integration MailChimp in Kommentabereich
add_action( 'comment_form', function() {
  ?>
  <!-- Paste your groupings HTML here, replacing this line -->
  <br>
  <hr>
  <h3>Newsletter abonnieren</h3>
  <p>
	<label>E-Mail: 
		<input type="email" name="EMAIL" placeholder="Deine E-Mail Adresse" required />
  </label>
  </p>
    <p>
        <label>Bitte Webseiten ausw&auml;hlen</label><br />
        <label>
            <input name="INTERESTS[2b24c8f06c][]" type="checkbox" value="e19db7caf7"> <span>KK4YOU</span>
        </label><br />
        <label>
            <input name="INTERESTS[2b24c8f06c][]" type="checkbox" value="f0f916c117"> <span>CUISINE4YOU</span>
        </label><br />
        <label>
            <input name="INTERESTS[2b24c8f06c][]" type="checkbox" value="4fec60168d"> <span>MSR-SUPPORT</span>
        </label>
    </p>
    <p>
    	<input type="submit" value="Registrieren" />
    </p>
  <?php
});

add_filter('mc4wp_integration_data', function($vars) {
  $vars['INTERESTS'] = isset($_POST['INTERESTS']) ? $_POST['INTERESTS'] : array();
  return $vars;
});

The page I need help with: [log in to see the link]