Hello, I've had this issue on both Big Sur and Monterrey. I need to yell like a mad man for Siri to hear me. It's fine when I say Hey Siri, but she won’t hear anything else after. I have the same issue when I invoke her through the keyboard or the icon. Since she can hear the Hey Siri and my microphone works well for Zoom call, I believe it's a software issue. I would have hoped the beta would've fixed it. Anybody had the same issue?