Can't get Ads to load

Hi,

Thanks to the developers behind this module for their work. I am trying to get this to work with my DFP account but have been struggling to figure out how exactly it works. I believe I'm a bit closer but can't get the Ads to be fetched. I've noticed from implementing the scripts and tags manually and then trying to implement this module that the module takes a very different approach from how Google recommends outputting tags so I think that may be where part of my confusion lies.

• I've setup the module to use the network ID.
• I have my units and custom placements in DFP configured.
• I've added a "DFP Ad Tag" in Drupal.
• My Ad unit is named PMF_RC_300x250
• I've used this as the "Ad Unit Name"
• When I attempt to load the block I get a "can't fetch ad" from the google console (see screen).
• If I attempt to load the tag manually using Google's generated tags/script it works just fine (see screen).