We couldn't find the AdSense code on your site

My Google AdSense dashboard showed the below when trying to verify site:

However, as you can see, from my site - mufcforum.co.uk, the Advert slots (with no adverts) are showing and see screenshot of admin page with publisher id entered:

I have had a look at dev tools and I can’t see the code in the head with the publisher id. Please can someone advise.

I have tried to rebuild the app aswell, and it makes no difference, still the below doesn’t eixst in the of the site:

<script data-ad-client="ca-pub-8325684976891305" async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>

Anyone got any ideas on this? Thanks

Currently could not find “ads.txt” file in your website. so you can add that code and try again.

Google Adsense doesn’t let you create that until after they have verified you.

Google have again come back and said the code doesn’t exist on the site despite filling the plugin setting as showed in the settings.