If you are experiencing issues with chat communications through the Steam client, please try the following to ensure that your microphone is configured correctly:
Microphone selection and settings in Steam
- Click Steam at the top right of the window on the main page
- From this within the dropdown menu that appears, click Settings
- From the Settings menu Navigate to the tab entitled Voice
- Proceed through the various options and confirm whether your Voice Input / Output devices as well as Volumes and Voice Transmission types are all correct. You can also test your microphone within this menu
For further audio and chat troubleshooting tips as well as information on general chat functionality, please view our support article for troubleshooting issues with Windows audio and chat.