This means that there seems to be a technical issue with your destination URL or landing page. For example, your landing page did not load when clicked, so it was not able to be reviewed.
​Example: When the review team looks at your landing page, they see a 404 error.

 
How To Fix
​Make sure that your destination URL and landing page are functioning properly. Then, update the URL of the campaign item.

To learn how to fix and resubmit your campaign or campaign item, click here.
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To learn more about setting up a new campaign setting, click here. To learn more about adding URL parameters and tracking, click here.