Google H5 Ads Sample project is not working

I have been trying to integrate google H5 ads into my Playcanvas game. I was following the H5 Ads tutorial on the playcanvas website, but when testing my game it was not working, I then I tried to play the “completed” example project linked at the bottom of the tutorial and found that it was not working either, and not showing any test ads. This leads me to believe that my project is not working because there has been some change to the SDK or something that would not be able to detect.

Thank you!