Any Idea Why This Adwords Event Code Isn't Working?

[Harry_]

Hey everyone, if there are any code ninjas out there I'm having difficulty with my Google Ads Event Tracking Tag.

It's installed in the Checkout, Additional Scripts page section and I've added some Liquid according to the instructions on shopify's own help article (https://help.shopify.com/en/manual/promoting-marketing/analyze-marketing/tracking-adwords-conversion...) to dynamiclally pull product value into Ads but it's showing as unverified. Installed over a week ago, conversions since then. 

Any help is massively appreciated!

Here's the code: 

{% if first_time_accessed %}
<!-- Event snippet for Sales 2018 (*New Tag) conversion page -->
<script>
  gtag('event', 'conversion', {
      'send_to': 'REMOVED BUT IT'S IN THE REAL ONE',
      'value': {{ checkout.subtotal_price | money_without_currency }},
      'currency': 'USD',
      'transaction_id': '{{ order_number  }}'
  });
</script>
{% endif %}