Unable to track form Signup and Success

Hi.

I am using MailChimp for WP to create a form on my website:

https://44reports.com/

It works great and I am able to collect signups.

My problem is that I would like to track form successes and/or signups.
I am able to track form errors and starts following the documentation from these articles:
https://kb.mc4wp.com/javascript-form-events/
https://kb.mc4wp.com/form-events-google-analytics-tracking/

However no event seems to fire on a success.

This is my form code:

<h2>
  Bliv alfa-tester
</h2> 	
	<div class="input-icon-wrapper">
      <div class="input-icon">
        <i class="fa fa-user" aria-hidden="true"></i>
      </div>
      <input type="text" name="NAME" placeholder="navn" required>
      <!--<span class="help-tip">Vi vil gerne l?re dig at kende.</span>-->
	</div>

	<div class="input-icon-wrapper">
      <div class="input-icon">
        <i class="fa fa-envelope" aria-hidden="true"></i>
      </div>
      <input type="email" name="EMAIL" placeholder="e-mail" required />
      <!--<span class="help-tip">Vi vil gerne l?re dig at kende.</span>-->
	</div>

	<div class="input-icon-wrapper">
      <div class="input-icon">
        <i class="fa fa-building" aria-hidden="true"></i>
      </div>
      <input type="text" name="WEBSITE" placeholder="website" required>
      <!--<span class="help-tip">Vi vil gerne l?re dig at kende.</span>-->
	</div>

	<div class="input-submit-wrapper">
      <div class="input-submit-icon">
        <i class="fa fa-arrow-right" aria-hidden="true"></i>
      </div>
      <input class="main-cta button-cta" type="submit" value="Bliv alfa-tester nu" />
	</div>

<script type="text/javascript">
mc4wp.forms.on('success', function(form) {
	dataLayer.push({'event': 'form-success',
                   'eventLabel': 'frontpage-hero-form'
                   });
});
mc4wp.forms.on('started', function(form) {
  	dataLayer.push({'event': 'form-started',
                   'eventLabel': 'frontpage-hero-form'
                   });
});
mc4wp.forms.on('error', function(form) {
	dataLayer.push({'event': 'form-submit-error',
                   'eventLabel': 'frontpage-hero-form'
                   });
});
</script>
<script type="text/javascript">
mc4wp.forms.on('subscribed', function(form) {
	// analytics.js
	ga && ga('send', 'event', 'Forms', 'Sign-up', 'Name: ' + form.name + 'ID: ' + form.id);
});
</script>

Thank you in advance

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