What to do about Microphone alerts?

In example, I just got an alert that Microsoft backgroundtaskhost.exe has activated the microphone for whatever reason.
What can I do about that? I can blacklist it in Firewall… but I can’t actually forbid it to use Microphone?

Thanks

We don’t lock the microphone/webcam unfortunately. It’s just to give you a heads up so you know the problem is happening.