There are several things you can try to Fix Google Chat not working:

Check your internet connection: Make sure your device is connected to the internet and the connection is stable.

Clear cache and cookies: Clearing the cache and cookies of your browser or the Google Chat app can help resolve any temporary issues.

Disable browser extensions: Sometimes browser extensions can interfere with the functioning of Google Chat. Disable any browser extensions that might be causing the issue.

Check Google Chat status: Check the Google Workspace Status Dashboard to see if there are any reported issues with Google Chat.

Restart your device: Restarting your device can sometimes fix any issues you're experiencing with Google Chat.

Try a different browser or device: If Google Chat still isn't working, try accessing it from a different browser or device.

Contact Google Support: If none of the above solutions work, contact Google Support for further assistance.