I had created several nice AdWords campaigns for Valohai.
I had created dashboards to Data Studio to see how the campaigns work. But conversion section in my campaign tables showed 0.
I went to Analytics Model Comparison Tool (Conversions > Attribution > Model comparison tool) where it is possible to compare how your campaigns work with different attribution models. I noticed, that if I used last interaction model, which is the default model, the conversions came from the referral source. But if I used first interaction model, presenting the conversions according the first touch point of the visitors, I was able to see that the conversion actually came from paid traffic even though my campaign reports didn’t show any conversion.
Investigating further I could see that the referral traffic actually came from our own page.
We have domains valohai.com and app.valohai.com. Goal is located in app.valohai.com and traffic comes from valohai.com.
I was self referring.
Cross domain tracking or subdomain tracking?
First I was incorrectly looking instructions for cross domain tracking but what I should actually be searching for was subdomain tracking.
Instead of reinventing the wheel, I’ll give you this link: https://www.lunametrics.com/blog/2015/06/16/cross-domain-tracking-with-google-tag-manager/
There you will find instructions on how to fix subdomain tracking problem with Google Tag Manager.