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Make sure you have installed Visual Studio 16.4 or higher on Windows or Visual Studio for Mac 8.4 or higher on Mac.
Then prepare your application for Release
Change the Android Package Format to bundle
. And other settings like my following screenshot.
After you’ve completed these steps, you can generate an app bundle by right clicking your project and selecting Archive. This will generate an app bundle for your application.
Here is a step by step ways to generate aab file.
https://devblogs.microsoft.com/xamarin/android-app-bundle/
Best Regards,
Leon Lu
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