The first thing you can do is go over our article of common Campaign decline reasons:
​http://help-advertisers.ad-maven.com/advertisers-self-service-faq/why-was-my-campaign-declined

Once your campaign has been declined, you will receive an alert via email with a campaign number for reference.
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In order to fully understand why your campaign was declined please do the following:

   2. Click on Creatives:
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   3. By clicking on the information icon under the status column, you will be able to see the reason your campaign was declined:
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