Question GrammarRecognizer Problems within Unity, nothing is recognized, need Help please

I am programming an App for my bachelor thesis for HoloLens2 and i am familiar with C# / Unity.
I tried the whole day to get this to work.

Unity Version is 2020.3.6f1
Visual Studio 2019 (version 16.9.4)

My Code:

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.Windows.Speech;
3.  
4. public class test : MonoBehaviour
5. {
6.     private GrammarRecognizer m_recognizer;
7.     public GrammarRecognizer Recognizer { get => m_recognizer; set => m_recognizer = value; }
8.  
9.     void Start()
10.     {
11.         Recognizer = new GrammarRecognizer(Application.streamingAssetsPath + "/SRGS/test.xml");
12.         Recognizer.OnPhraseRecognized += Recognizer_OnPhraseRecognized;
13.         Recognizer.Start();
14.     }
15.  
16.     private void Recognizer_OnPhraseRecognized(PhraseRecognizedEventArgs args)
17.     {
18.         Debug.Log("I recognized something");
19.     }
20.  
21.     // Update is called once per frame
22.     void Update()
23.     {
24.         if(Recognizer.IsRunning)
25.         {
26.             Debug.Log("Running");
27.         }
28.     }
29. }

And the XML File:

<grammar version="1.0" xml:lang="en-US" root="rootRule"
xmlns="http://www.w3.org/2001/06/grammar">

<rule id="rootRule">
<item>play</item>
</rule>

</grammar>


I dont understand why this is not working. I implemented the DictationHandler without any problems and everything is recognized. The DictationHandler is not running while i test the GrammarRecognizer.

 

Hello

Could you find a solution ?
I have the same problem. I suspect the gramma file path is problematic on Hololens, and tried some alternatives, but no error, no exception... and no recognition !

Did you find the source of the problem ?
Thanks a lot