my headset chat mixer is greyed out and i can’t fix it

Hi Dolla!

I am sorry to hear about the issue. Let's do our best to get this sorted out.

What exactly is your console model? Also your headset make/model?
When did it stop working?

To further isolate the issue, have you tried a different headset?

If this is a system issue, we could also perform a factory reset. There's an option to keep your games and apps.
Press the Xbox button to open the guide.
Select Profile & system > Settings > System > Console info.
Select Reset console.
On the Reset your console? Please choose “Reset and keep my games & apps”

Are you using a wireless headset like Astro A50? If so then you have to use the physical chat mixer that is built in to the headset as the console guide chat mixer will be greyed out.

Good luck!

Hi,

my headset is plugged into the controller but it wont let me do anything to the chat mixer and the chatmixer bit is greyed out.

Thank you for that. Unfortunately it hasnt worked. I still cant hear any game chat, and the chat mixer is still greyed out.

I should point out that if I plug my wired headset into my wireless controller, I can hear chat.

Try the following:

1. Examine the headphones, cable and connector for visible defects.

2. Make sure there is no dust or dirt on the headphone jack. To clean the connector, use a cotton swab soaked in alcohol.

3. Check that the Xbox controller is working correctly.

4. Firmly insert the Xbox One Headset connector into the expansion port located under the D-pad and right stick on the controller.

Solution 2:

If you set up a profile for a minor on the console, the Online Privacy & Safety options allow the owner of an adult profile to control who can communicate with the minor profile in Xbox Live chats. In the Online Privacy and Safety section, you can enable chat communication in the child's profile. For players under 17, the default setting is Friends Only.
To configure online privacy and security options from your PC, see:
https://account.xbox.com/Settings?wa=wsignin1.0&activetab=main:privacytab

Solution 3: Re-associate your controller with your profile

1. Press the Xbox  button to open the guide.

2. Select Profile & system > Settings > Devices & connections > Accessories.

3. Select your controller and then the (...) button.

4. Under Assigned to, choose your gamertag.

Solution 4: Check the NAT type of your network

Network Address Translation (NAT) allows you to hide your IP address from devices that are not on your network. For more information about NAT, see the "Current network status" section at:
https://support.xbox.com/help/hardware-network/connect-network/network-settings

Solution 5: Try your Xbox One chat headset

To test your headphones, start a group (requires an Internet connection) to check your audio:

1. Sign in to your console.

2. Press the Xbox  button to open the guide.
Under Groups & chats, select Start a group. (You don't need to invite anyone for this test.)

3. Make sure the microphone is not muted in the group chat.
Note: You can use the Y button  on the controller to turn the sound on or off.

4. Make sure the headphones are not muted and the TV volume is high enough.

5. Speak into the microphone. If the headphones are working, you will see the ring around your gamer image light up.

Information Source (Credits): https://support.xbox.com/help/hardware-network/accessories/troubleshoot-chat-headset