Problem Description
From August 2021, new apps listed on Google Play must use the AAB format, and apps already listed will not be affected. The signature has also become stricter. If you use a signature generated a few years ago, after uploading the aab installation package, the following problems may occur.
For new apps, Android App Bundles must be signed with an RSA key.
According to the error message: the aab installation package needs to be signed with an RSA key. So we use the latest development tools (latest Android Studio version) to create the signature.
solution
Open Android Studio and select Build > Generate Signed Bundle/APK on the menu bar
In the pop-up window, select Android App Bundle or APK and click NEXT
In the next window, click Create New
In the New Key Store window, fill in the signature information and click OK to generate the signature.
Finally, repackage the AAB with the new signature and upload it to Google play.