The campaign validates, is active, but receives too few impressions.
To find out why this happens, go through a few steps:
|Can more inventory be targeted||Campaigns - Campaign Setup - Bid Strategies|
|Can the geographical target area be wider?||Campaigns - Campaign Setup - Audience|
|Is the audience too small? If using retargeting, consider not using any geographical targeting||Campaigns - Campaign Setup - Audience|
Can more ad formats be added to the campaign?
|Campaigns - Campaign Setup - Ads|
|If win rate is low - increase max CPM||Campaigns - Campaign Setup - Bid Strategies|
|If retargeting - is cookie base large enough?||Advertisers - Segment statistics|
|Change visibility target (targeting only on above the fold may reduce available inventory significantly||Campaigns - Campaign Setup - Filters|
|Are publishers blocking your ads - look for low win rate||Campaigns - Campaign Setup - Bid Strategies|