I'm having trouble with the hololens grammar recognizer. When I initially start my app and the room is quiet it works pretty close to perfectly. However if I'm demonstrating my app and there's a few people in the room the grammar recognizer will either have much more trouble picking up the commands or fail entirely and no commands will work until restarting the app. I can have 2-3 hololens in the same room and on the same build and 1 will sometimes not work and I'll get the following error when I boot up the application. Exception thrown: 'UnityEngine.UnityException' in UnityEngineProxy.dll 'sbirs-ar.exe' (CoreCLR: CoreCLR_UWP_Domain): Loaded 'C:\Data\Users\DefaultAccount\AppData\Local\DevelopmentFiles\sbirs-arVS.Release_x86.ww31785\System.Diagnostics.StackTrace.dll'. Symbols loaded. UnityException: Speech recognition is not supported on this machine. at UnityEngineProxy.InternalCalls.PhraseRecognizer_CUSTOM_Start_Internal(IntPtr recognizer) at UnityEngine.Windows.Speech.PhraseRecognizer.Start() at Src_GrammarRecognizer.Start() at Src_GrammarRecognizer.$Invoke2(Int64 instance, Int64* args) at UnityEngine.Internal.$MethodUtility.InvokeMethod(Int64 instance, Int64* args, IntPtr method) (Filename: <Unknown> Line: 0) However this error doesn't always show up, if it does show up the app voice recognition won't work until restarting the hololens completely. If you're trying to give a demo, having the grammar recognizer break because people around you are talking is a huge pain. I'm on 10.0.17134.111 and unity 2017.4.12f1 I found some other people having the same issue here: https://forums.hololens.com/discuss...ed-since-rs4-update-in-july-2018-on-hololens?