Blocked / denied creatives:
When creatives are uploaded into a campaign they are automatically forwarded for approval process directly at the exchanges / publishers, the feedback can be approved or denied.
In case the creatives do not approved by the exchange, they will reply with a status blocked / denied.
means that the ad exchange - themselves find that the creative is violation one of their specific guidelines.
In general, exchanges will approve creatives based on:
Creatives
Landing Page URL
In case your creatives have been denied follow this process
* For more info please read our ad quality guidelines.