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I have tested official voice command sample (The SpeechInputExample scene in MRTK/Examples/Demos/Input/Scenes/Speech). The sample functioned as expected after being deployed to HoloLens and I didn’t reproduce your issue.
My environment:
Unity 2021.3.27f1
Visual Studio 2022
MRTK 2.8.3
Mixed Reality Open XR 1.9.0
You can try this sample with Unity 2021.3 LTS (recommend version). If this issue persists, it could potentially be a hardware-related problem. In such a case, consider testing it on a different device.
To acquire MRTK 2 examples scenes, please refer to Example scenes - MRTK 2 | Microsoft Learn.
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