I want to implement the utm_campaign variable in the DFP tag. So, I used the following sources:
Google DFP: Pass UTM_Source to DFP with javascript (without accessing the DFP Admin)
GPT - Non key value ads showing in key valuse ad slots
So I added
.setTargeting('utm_campaign', '< ?php echo $_GET['utm_campaign']; ?>');
to the code.
But I can't get the reporting to work. I have setup a free-form key-value in the DFP admin, but it is not showing when I run a report. Only the key-values with pre-defined values show up in the reporting.
How can I get the reporting to work, so I can see DFP statistics per utm_campaign?