Hello,
Could you please go to your setting to double check if you enabled it successfully ?
Privacy policy for microphone access
If the user clicks Yes to grant access to the microphone, your app is added to the list of approved applications on the Settings -> Privacy -> Microphone page. However, as the user can choose to turn this setting off at any time, you should confirm that your app has access to the microphone before attempting to use it.
If you also want to support dictation, Cortana, or other speech recognition services (such as a predefined grammar defined in a topic constraint), you must also confirm that Online speech recognition (Settings -> Privacy -> Speech) is enabled.
Regards,
Yutong