The Debug msg I see may helpful is these:
info: SpeechToText[0]
DecoderStop correlationId='46d4cd9b-8208-49e1-b22b-071c098a4a70' connectionId='e3803d4a-fabb-4e5e-97a8-b98ffab8900e' clientConnectionId='f5c4ec51-e480-400f-80b0-8b37481b1f00' impressionId='c3c83ad3-a5f3-4b60-9d0b-ee4a4a2f3f6c' turnId='a5da1392-a4ec-456e-9bc8-afc92af59c90' clientId='00000000-0000-0000-0000-000000000000' trafficType='Untagged' locale='zh-CN' endpoint='/speech/recognition/conversation/cognitiveservices/v1' Event_Time_Utc='2022-09-02T09:56:51.2364809Z' activityId='' relatedActivityId='' decoderInstanceId='ab1ec349-5457-4dda-95b8-11516ddfde11' recognitionType='Conversation' options='{"Locale":"zh-CN","ScenarioType":"Conversation","GrammarScenario":null,"InitialSilenceTimeout":null,"TrailingSilenceTimeout":null,"MaxNBestCount":5,"BondedAudioFormat":{},"KeywordSilenceTimeout":null,"IsEprEnabled":false,"SegmentationMode":"Normal","InterimResults":true,"SegmentationSilenceTimeout":null}' audioStartTime='2022-09-02T09:56:41.1383140Z' audioEndTime='2022-09-02T09:56:41.4673758Z' audioSizeBytes='896334' audioDuration='28010' speechDuration='' firstIntermediatePhraseTime='' firstFinalPhraseTime='' firstIntermediatePhraseStartOfSpeechLatency='' firstIntermediatePhraseRecognitionLatency='' firstFinalPhraseRecognitionLatency='' firstFinalPhraseRecognitionStatus='' lastFinalPhraseTime='' lastFinalPhraseRecognitionStatus='' lastFinalPhraseRecognitionLatency='' totalFinalPhraseCount='0' streamEndReason='' averageAudioFlowRate='85.12078886093737' reconnectCount='10' hasRecognitionDegraded='False' recognitionDegradedReason='' startTime='2022-09-02T09:56:41.1382953Z' endTime='2022-09-02T09:56:51.2364809Z' error='Grpc.Core.RpcException: Status(StatusCode="Unknown", Detail="Unexpected error in RPC handling")
at Grpc.Core.Internal.ClientResponseStream2.MoveNext(CancellationToken token) at Shared.Grpc.Abstractions.ActiveRpcTrackingInterceptor.AsyncStreamReaderProxy
1.MoveNext(CancellationToken cancellationToken)
at Shared.Grpc.Net.Interceptors.InstrumentedInterceptor.AsyncStreamReaderProxy1.MoveNext(CancellationToken cancellationToken) at SpeechRecognition.Clients.Extensions.Decoder.Rpc.ResilientRecognizeAsyncDuplexStreamingCall.<>c__DisplayClass32_0.<<MoveNext>b__0>d.MoveNext() --- End of stack trace from previous location --- at Polly.Retry.AsyncRetryEngine.ImplementationAsync[TResult](Func
3 action, Context context, CancellationToken cancellationToken, ExceptionPredicates shouldRetryExceptionPredicates, ResultPredicates1 shouldRetryResultPredicates, Func
5 onRetryAsync, Int32 permittedRetryCount, IEnumerable1 sleepDurationsEnumerable, Func
4 sleepDurationProvider, Boolean continueOnCapturedContext)
at Polly.AsyncPolicy.ExecuteAsyncTResult
at SpeechRecognition.Clients.Extensions.Decoder.Rpc.ResilientRecognizeAsyncDuplexStreamingCall.MoveNext(CancellationToken cancellationToken)
at SpeechRecognition.Clients.Decoder.Rpc.RpcRecognition1.HandleResponsesAsync(IAsyncStreamReader
1 responseStream, CancellationToken cancellationToken)
at SpeechRecognition.Clients.Extensions.Decoder.Rpc.ResilientRecognizeAsyncDuplexStreamingCall.CompleteAsync()
at SpeechRecognition.Clients.Decoder.Rpc.RpcRecognition1.CompleteRecognitionRequestAsync() at SpeechRecognition.Clients.Decoder.Rpc.RpcRecognition
1.CleanUpAsync(Exception e)' decoderLocale='zh-CN'
info: SpeechToText[0]