Hi armandsf,
Are you attempting to use the microphone to search in Safari? If not, can you let us know where you're attempting to use the microphone within Safari?
Also, were the steps below found in the article here the ones used when checking your microphone hardware access?: Control access to hardware features on iPhone
"Review or change access to the camera, microphone, and other hardware features
- Go to Settings
> Privacy & Security. - Tap a hardware feature, such as Camera, Bluetooth, Local Network, or Microphone.
The list shows the apps that requested access. You can turn access on or off for any app on the list."
These questions will help us rule out know the best steps forward and what has already been completed. Keep us posted, and we'll continue to assist.
Cheers.