Hey @Roland_Rossmanek,
could you please delete all code snippets from Usercentrics that you added to your website and only add the first code you posted is the one that should be added to the meta tag field in Sitejet. Also, please make sure to change the ID “XXXXXXXXX” in this code line to the one you find in your Usercentrics’ admin panel.
<script type="application/javascript" src="https://app.usercentrics.eu/latest/main.js" id="XXXXXXXXX"></script>
Here is the link to Usercentrics’ implementation guide Usercentrics Documentation and a screenshot of the most important part:
Please let me know if this worked 
Hey @Ulf_Siemen, I added your request to our feature request list. At the moment we only offer the native cookie consent solution available as displayed in the CMS. There are also consent management tools that offer free versions