Edit Manifest file and target API level

[Anke]

@aalmokhtaaare

(Your app is currently targeting API level 30, but it must target at least level 31 to ensure that it is based on the latest security and performance-optimized APIs. You can change the API level your app targets to at least level 31.)
What is the solution please?

Target API level 31

Try the test server (which already taegets SDK 31).

Target API level 31

Not really a "simple" solution: Build the APK. Decompile it. Edit the Manifest and add android:exported="true" to each <activity ... > and <receiver ... >. Set targetSdkVersion = 31. Recompile it. Check if the app (APK) can be installed on your test devices. If so, convert the APK to AAB: Convert APK TO AAB File - Guides - Niotron Community (otherwise check if you missed to add android:exported="true" to every <activity> and <receiver> and continue with step 4).