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You can refer to this thread directly to generate aab file.
https://devblogs.microsoft.com/xamarin/android-app-bundle/
Normally, I will unload the project, then edit project file, find the <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
release tag, add <AndroidPackageFormat>aab</AndroidPackageFormat>
, then you can reload your project, change your solution configuration to release, archive your project. This will generate an app bundle for your application.
Best Regards,
Leon Lu
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