No impressions from specific inventory source

Problem

Impressions are not won for certain inventory.

Solution 

There can be a number of reasons why bids are not generating impressions

1. Start with verifying whether bids are placed on the inventory domains in question by viewing the Sites section of the campaign
2. If bids are placed but no impressions generated, there can be a number of reasons:
   1. Floor price is not met. If the bid is below floor price, it is never sent by BidTheatre. Inspect floor prices in the Inventory tab.
   2. Bids are outplaced by competition. A competiting bidder is simply bidding higher.
   3. Campaign or advertiser is not whitelisted by the seller. Certain sellers need to explicitly whitelist demand in order for a transaction to occur. Get to know your seller and contact them directly if this seems to be the case.
3. If bids are not placed, it is likely that targeting is set in a way that excludes the inventory. This could be due to
   1. Device targeting
   2. Visibility targeting
   3. Geo targeting
   4. Filters
   5. ... etcetera