Hi Vu,
Thanks for replying. The test device ID doesn't show up in the log when I use the addTestDevice command. The logcat I posted, was from a device trying to load live ads, where test ads had failed to load with the same error (No fill from ad server).
As for the affected ad units, there are four of them. I first tried to test the admob integration using a test app which wasn't published on the app store. For the test app, I created a banner and an interstitial ad and both failed to load with same error.
I assumed it could be a bug that affected non published titles, so I tried the same by creating 2 more ad units (banner and interstitial again) for one of my published apps but faced the same error.
The affected ad unit ids are :
1. Test App - banner - ca-app-pub-3359501178475033/
6149331307 - interstitial - ca-app-pub-3359501178475033/
43563705092. Vasco VR - banner - ca-app-pub-3359501178475033/6273755700
- interstitial - ca-app-pub-3359501178475033/6494081708
Let me know if anything else is required. Thanks!