WebSocket upgrade failed: Authentication error (401). Please check subscription information and region name

Question

WebSocket upgrade failed: Authentication error (401). Please check subscription information and region name

Sanjay Santra 0

I am continuously getting the following error when trying to access Azure speech services from a C# windows forms app:
WebSocket upgrade failed: Authentication error (401). Please check subscription information and region name

The speech resource is S0 tier
Registered an Entra ID app and gave permission to Microsoft Cognitive Services
Under role assignment of speech resource, added the Entra ID app (service principal) with Cognitive Services Speech User and Cognitive Services Speech Contributor permissions
Created a custom domain name and private endpoint for the speech resource What I am missing out: Here's the code: TokenRequestContext context = new Azure.Core.TokenRequestContext(new string[] { "https://cognitiveservices.azure.com/.default" }); //InteractiveBrowserCredential browserCredential = new InteractiveBrowserCredential(); var credential = new InteractiveBrowserCredential(new InteractiveBrowserCredentialOptions {
```
TenantId = "",

ClientId = ""
```
}); var browserToken = credential.GetToken(context); string aadToken = browserToken.Token; // Define the custom domain endpoint for your Speech resource. var endpoint = "wss://customdomain.cognitiveservices.azure.com/stt/speech/universal/v2"; string resourceId = "/subscriptions/...."; string region = "eastus"; // You need to include the "aad#" prefix and the "#" (hash) separator between resource ID and Microsoft Entra access token. var authorizationToken = $"aad#{resourceId}#{aadToken}"; SpeechTranslationConfig translationConfig = SpeechTranslationConfig.FromAuthorizationToken(authorizationToken, region); translationConfig.SpeechRecognitionLanguage = "en-US"; translationConfig.AddTargetLanguage("fr"); // English to French // Enable Cognitive Services Logging string logFilePath = "speech-sdk-log.txt"; translationConfig.SetProperty(PropertyId.Speech_LogFilename, logFilePath); Console.WriteLine($"📄 Logging enabled. Logs will be saved to: {logFilePath}"); using var recognizer = new TranslationRecognizer(translationConfig); Console.WriteLine("Speak something..."); var result = await recognizer.RecognizeOnceAsync(); if (result.Reason == ResultReason.TranslatedSpeech) {
```
Console.WriteLine($"Original: {result.Text}");

foreach (var (lang, translation) in result.Translations)

{

    Console.WriteLine($"Translated [{lang}]: {translation}");

}
```
} else if (result.Reason == ResultReason.Canceled) {
```
var cancellation = CancellationDetails.FromResult(result);

Console.WriteLine($"Speech translation canceled: {cancellation.Reason}");

if (cancellation.Reason == CancellationReason.Error)

{

    Console.WriteLine($"Error Code: {cancellation.ErrorCode}");

    Console.WriteLine($"Error Details: {cancellation.ErrorDetails}");

}
```
} else {
```
Console.WriteLine($"Speech Recognition Failed: {result.Reason}");
```
}

Sanjay Santra 0

Here's the code:

TokenRequestContext context = new Azure.Core.TokenRequestContext(new string[] { "https://cognitiveservices.azure.com/.default" });

var credential = new InteractiveBrowserCredential(new InteractiveBrowserCredentialOptions
{
    TenantId = "",
    ClientId = ""
});
var browserToken = credential.GetToken(context);
string aadToken = browserToken.Token;
       
// Define the custom domain endpoint for your Speech resource.
var endpoint = "wss://customdomain.cognitiveservices.azure.com/stt/speech/universal/v2";
       
string resourceId = "/subscriptions/...";        
string region = "eastus";
// You need to include the "aad#" prefix and the "#" (hash) separator between resource ID and Microsoft Entra access token.
var authorizationToken = $"aad#{resourceId}#{aadToken}";
SpeechTranslationConfig translationConfig = SpeechTranslationConfig.FromAuthorizationToken(authorizationToken, region);
translationConfig.SpeechRecognitionLanguage = "en-US";
translationConfig.AddTargetLanguage("fr"); // English to French
// Enable Cognitive Services Logging
string logFilePath = "speech-sdk-log.txt";
translationConfig.SetProperty(PropertyId.Speech_LogFilename, logFilePath);
Console.WriteLine($"📄 Logging enabled. Logs will be saved to: {logFilePath}");
using var recognizer = new TranslationRecognizer(translationConfig);
Console.WriteLine("Speak something...");
var result = await recognizer.RecognizeOnceAsync();
if (result.Reason == ResultReason.TranslatedSpeech)
{
    Console.WriteLine($"Original: {result.Text}");
    foreach (var (lang, translation) in result.Translations)
    {
        Console.WriteLine($"Translated [{lang}]: {translation}");
    }
}
else if (result.Reason == ResultReason.Canceled)
{
    var cancellation = CancellationDetails.FromResult(result);
    Console.WriteLine($"Speech translation canceled: {cancellation.Reason}");
    if (cancellation.Reason == CancellationReason.Error)
    {
        Console.WriteLine($"Error Code: {cancellation.ErrorCode}");
        Console.WriteLine($"Error Details: {cancellation.ErrorDetails}");
    }
}
else
{
    Console.WriteLine($"Speech Recognition Failed: {result.Reason}");
}

Manas Mohanty 3,125 Microsoft External Staff

Hi Sanjay Santra

The above code is not taking subscription data as per this documentation

Could you use the below syntax to use input params as much as possible and let us know.


SpeechTranslationConfig(subscription: str | None = None, region: str | None = None, endpoint: str | None = None, host: str | None = None, auth_token: str | None = None, target_languages: Iterable[str] = [], voice_name: str = '', speech_recognition_language: str = '')

instead of

SpeechTranslationConfig translationConfig = SpeechTranslationConfig.FromAuthorizationToken(authorizationToken, region);

Thank you.

Manas Mohanty 3,125 Reputation points Microsoft External Staff

2025-04-01T06:35:53.4366667+00:00

Hi Sanjay Santra

We are checking if the above inputs helped address your issue.

Thank you.
Manas Mohanty 3,125 Reputation points Microsoft External Staff

2025-04-02T08:18:42.84+00:00

Hi Sanjay Santra

We have not heard from you. Hope the pointers shared were useful to you.

Thank you.

Your answer

Manas Mohanty 3,125 Reputation points Microsoft External Staff

2025-03-31T11:19:52.9766667+00:00

Hi Sanjay Santra

The above code is not taking subscription data as per this documentation

Could you use the below syntax to use input params as much as possible and let us know.

SpeechTranslationConfig(subscription: str | None = None, region: str | None = None, endpoint: str | None = None, host: str | None = None, auth_token: str | None = None, target_languages: Iterable[str] = [], voice_name: str = '', speech_recognition_language: str = '')

instead of

SpeechTranslationConfig translationConfig = SpeechTranslationConfig.FromAuthorizationToken(authorizationToken, region);

Thank you.
Manas Mohanty 3,125 Reputation points Microsoft External Staff

2025-04-01T06:35:53.4366667+00:00

Hi Sanjay Santra

We are checking if the above inputs helped address your issue.

Thank you.
Manas Mohanty 3,125 Reputation points Microsoft External Staff

2025-04-02T08:18:42.84+00:00

Hi Sanjay Santra

We have not heard from you. Hope the pointers shared were useful to you.

Thank you.

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WebSocket upgrade failed: Authentication error (401). Please check subscription information and region name

Your answer