Microsoft Bing Speech API: Access denied due to invalid subscription key. Make sure to provide a valid key for an active subscription
<p>I tried to issue token for voice recognition request as in Microsoft Cognitive Services <a href="https://www.microsoft.com/cognitive-services/en-us/speech-api/documentation/api-reference-rest/bingvoicerecognition" rel="nofollow noreferrer">Bing Speech API tutorial</a> from Postman:</p>

<p><a href="https://i.stack.imgur.com/uF5Ht.png" rel="nofollow noreferrer">enter image description here</a></p>

<p>Input URL encoded string is:</p>

<pre><code>grant_type=client_credentials&amp;client_id=[my_key]&amp;client_secret=[my_key]&amp;scope=https%3A%2F%2Fspeech.platform.bing.com
</code></pre>

<p>And API responds with error:</p>

<pre><code>{
   "statusCode": 401,
   "message": "Access denied due to invalid subscription key. Make sure to provide a valid key for an active subscription."
}
</code></pre>

<p>What am I doing wrong?</p>

<p>I saw the similar <a href="https://stackoverflow.com/questions/37969050/correct-key-for-microsoft-cognitive-api">issue</a>, but I don't see update about Bing Speech API in answer.</p>

<p>Thanks in advance.</p>