not getting any impressions
I set up a new campaign for display network - all features.
I set new campaign to show ads only in US, for selected mobile devices only. I entered 14 keywords, 37 placements ( different websites), speicifc gender & age. I didn't set any topics or interests.
The status for my keywords \ placements is eligble.
Both of my ads were approved, the campaign is running now for over 48 hours yet not even one single impression.
What could be the reason for this?