The Google Adwords Ad Diagnostics tool can only provide diagnosis information on keywords that are opted into the Google Search Network.
Ads exclusively targeting the Google Display Network don’t report whether an ad is being shown or its Quality Score.
The total number of impressions generated and click through percentage a particular ad or ad group receive are the easiest way to diagnose a Google Display Network ad’s overall quality.
Tags: Google Adwords Ad Diagnostics Tool, Google Search Network
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