Unmute Xbox one s

Can you provide a bit more information? What type of headset is he using? Is it one that plugs directly into the controller with a regular 3.5mm headphone jack, or is this connected via the Xbox console? Is he able to hear sounds from the headset, can't
speak, or can he not hear or speak?

The crossed out mic symbol you're seeing in the top right does indicate that the console does not detect input for a mic, so you're correct there.

Another possibility of your issue might be an issue with your Network NAT type. This is less likely, as you indicated that there is the symbol for not recognizing the microphone on the system, but still might be worth looking into to improve your gaming
and chat experience. Sometimes if there is a mismatched NAT then you would be able to hear others, but they would not be able to hear you: https://support.xbox.com/en-US/xbox-one/networking/nat-error-solution

Hello robertlaverty,

Thank you for posting on the Xbox forums. This is a known issue that we are currently working on resolving. We are recommending to contact the
Xbox support team to report the issue. We will provide steps on how to contact the support team. Be sure to keep us updated!

1. Click the support link we provided
2. Select Xbox One in the category area
3. Select See other options
4. Select Set up my Xbox One console
5. Select Show contact options
6. Select Request a call from Support

Check this link for a possible solution:
https://support.xbox.com/en-US/xbox-one/accessories/wired-headset-help

You could try these steps: https://support.xbox.com/en-US/xbox-one/accessories/wired-headset-help

The Recon 70 has a volume control on the left ear and the mic mutes when you raise it. Very simple and straight forward to operate. I'm plugging it directly in to controller.