Hello @Damon Pan ,
Welcome to Microsoft Q&A!
whether "WinUI3 app" can access voice assistant features
I checked the PackageReference and Capabilities of UWPVoiceAssistantSample, and I also used Azure Speech SDK in WinUI3 project, it works in WinUI3 project.
In fact, the sample of Cognitive-Services-Voice-Assistant also supports WPF, C# .net core and C++.
Thank you
Junjie
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