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Azure speech batch transcription webhooks no longer calling back

First thing to check is the state of your webhook with a GET on it. The service flips the webhook to Failed if there were too many failures calling into your callback, and once it is Failed it stops trying. If that is what you see, just PATCH the url to the same value to enable it again, and the web…

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Azure custom Chinese lexicon ignored by SpeakSsmlAsync

A few things can make the whole lexicon get silently ignored. First, when the lexicon content changes it takes at least 15 minutes before the service picks up the new file, so retest after waiting. Second, and this is the big one: if even one word in the lexicon has a wrong pronunciation, the entire…

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Azure text to speech timeouts: WS_OPEN_ERROR_UNDERLYING_IO_OPEN_FAILED after Windows update

We confirmed this is caused by the October 2022 Windows security updates, which changed TLS behavior and broke the SDK connection to the TTS service. The fix is to install the out of band update for your build: KB5020435 for Windows 10 20H2 through 22H2, KB5020387 for Windows 11 21H2, and KB5018496 …

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Azure batch transcription speaker diarization not working - no Speaker property

Good catch, this one was tricky. From the service logs we could see your input file was stereo, and for stereo files diarization is not possible, so the diarization flag gets silently ignored. That silent ignore is a bug on our side, a fix was being deployed to return a clear error message in this c…

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