Hi,
It's always recommended to keep the SDKs up to date. As of today the latest version is 23.2.0. Please refer to these Google Mobile SDK release notes and Deprecation and sunset documentation.
Feel free to contact us, if you face any difficulties with latest SDK.
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Mobile Ads SDK Team |
Hi,
Yes, the mentioned build.gradle is correct. We have ran our Goggle sample project with test IDs and able to load ad successfully for mentioned API levels. The mentioned issue mainly depends upon ad inventory and we do not have control on it. The next step for you would be to reach out to the Product Support Team for further assistance regarding the ad serving concern.