Are you able to capture a device log while your game is running:
How To - Capturing Device Logs on Android
How To - Capturing Device Logs on iOS
This should clear up the exact reason you are not getting ads in your game. The most common reasons:
- You are not initializing the Ads SDK. (You should see something like “Initializing Unity Ads 3.x.x with game id 1234567 in production mode”.)
- You could be initializing Ads with the game ID for the wrong platform (using the iOS game ID for Android and vice versa).
If those aren’t the cause, could you post your device log here or open a support ticket:
unityads-support@unity3d.com