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 Friends & Chat from the bottom right corner of Steam
- Once viewing your Friends List windows, click the Settings cog from the top right hand corner
- From the Settings menu select 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, click here.