Azure cognitive services - Speech Synthesis stopped working

Question

Hi,

I've been using Speech Synthesis quite happily for several months, but on the 16th October it suddenly stopped working.

I have double checked my keys, and regenerated new ones, but the call to SpeakTextAsync (using the Microsoft.CognitiveServices.Speech nuget package) just eventually fails with a reason of Canceled.

Even a call to GetVoicesAsync results in an error, e.g.

Error in sending a http request. Details: Failed with error: HTTPAPI_OPEN_REQUEST_FAILED [0x3]
GET https://uksouth.tts.speech.microsoft.com/cognitiveservices/voices/list
X-ConnectionId: b9e1c706e75f443283b0e599caf69c12

Example code:

async Task Main()  
{  
	var speechSettings = new SpeechSettings  
	{  
		Key = "",  
		Region = "uksouth",  
		Voice = "en-US-JennyNeural"  
	};  
	  
	var config = SpeechConfig.FromSubscription(speechSettings.Key, speechSettings.Region);  
	  
	var synth = new SpeechSynthesizer(config);  
	  
	synth.Properties.SetProperty(PropertyId.SpeechServiceConnection_SynthVoice, speechSettings.Voice);  
	  
	await synth.SpeakTextAsync("Test sentence");  
}  
  
public class SpeechSettings  
{  
	public string Key { get; set; } = default;  
	public string Region { get; set; } = default;  
	public string Voice { get; set; } = default;  
}