Advertisements not showing

I am trying to hook up Units Ads 2.0 to my game. My Unity version is 5.5.2f1. In my services panel i can see that ads are on. When I go to the ads setting I have android selected, I have enabled test mode, i can see my game id, and I have enabled builtin ad extension. However I can never see an ad in the editor or when i build to a device. Advertisement.IsReady() always seems to be false, and I am clueless as to why. If someone could help that would be very much appreciated.

I got it working with the asset store package (at least in editor). Id rather use the service panel but im not sure what is wrong with it.