Requirements for competition with AdSense
Google AdSense content will only appear in an ad unit if all of the following criteria are met:
AdSense is enabled for the ad unit.
The competing line item's type is network, bulk, price priority or house. (Learn more about line item types)
The CPM of the AdSense ad is higher than the alternatives.
Enable AdSense at the network or ad unit level
AdSense can be toggled on and off at both the network level and the ad unit level. If you enable AdSense at the network level, this setting will be applied to all ad units by default unless you manually override it.
Ad unit-level settings for AdSense take precedence over network settings:
If AdSense is disabled for both the network and the ad unit: AdSense ads won't serve.
If AdSense is enabled for the network but disabled for the ad unit: AdSense ads won't serve.
If AdSense is disabled for the network but enabled for the ad unit: AdSense ads will serve.
If AdSense is enabled for both the network and the ad unit: AdSense ads will serve.
Set the default AdSense preferences for your network
Click the Inventory tab, then click Network settings on the left-hand panel.
Set the appropriate Default AdSense inventory settings.
Change AdSense preferences for an ad unit
Click the Inventory tab, then click Ad units in the left-hand panel.
In the ad units table, click the appropriate ad unit.
Next to 'AdSense inventory settings', click override.
Select the AdSense properties that you want to edit.