Interstitial Ads do not appear

While Ad Mobs work with no issues on the Android, Interstitial Ads do not seem to work when called upon in Blueprint.

Tested in 4.21.2 (CL- 4753647), 4.22 (CL - 5673098), 4.23 (CL - 5685256)

1. Download the project from this internal Box link: [Link Removed]
2. Connect Android device to computer
3. Package the attached project to Android ETC1
4. Within the packaging folder open the Install batch file
5. Once the batch finishes, open the project on the Android device
6. Touch the screen where it says play to load the game
7. Touch any of the ad buttons on the left side of the screen

Expected: A fullscreen should pop up

Result: No interstitial ads are loaded onto the phone