How come my ads from Admob aren’t showing?

Assuming you already took the proper steps and added the Ad Unit ID’s to your App Manager, it’s important to note that it can take Google up to 8 hours to active the Ads (Google will send you a confirmation). In addition, Interstitial ads appear upon navigation, not between each pages. That said, you’ll have to open 5-10 pages (randomly triggered) to demo the Ads.