You might see a warning message while submitting your APK file to Google Play Store, indicating you can no longer submit apps with API's older than API level 29, starting from August, 2020. (Target API level requirements from August 2020). You might also receive an email with the same content. This article explains why this occurs and what we are doing to comply with the requirements.
You received the following warning from Google:
Your app currently targets API level 28 and must target at least API level 29 to ensure it is built on the latest APIs optimized for security and performance.
From August 2020, new apps must target at least Android 10 (API level 29).
From November 2020, app updates must target Android 10 (API level 29).
You received this because your app appears to target an old API level version and needs to be updated according to Google's guidelines.
We are aware of this warning and have taken care of updating the code on our side. This is planned to be available in 50.22 release. Please follow our Release Notes to see when this will be rolled out.
Till November 2020, you can safely ignore the warning if you are just updating/republishing your app.
Your app will be compliant with Google's guidelines as it will target at least Android 10 (API Level 29) and therefore you won't be receiving this warning again.
Once the fix is released, you won't see the same warning next time you republish your app.