To resolve the issue of not being able to chat using Talkie on the Xbox browser, follow these troubleshooting steps:

1. Check Your Microphone Settings:
Ensure that your microphone is properly connected and working. You can test the microphone by using it in another application to check if it picks up sound correctly.

2. Assign Audio Devices:
Go to your Party widget and make sure that your audio input (microphone) and output (speakers/headset) are assigned correctly. Select the appropriate audio device you want to use for party chat. You can find this under the sound settings in Windows.

3. Audio Privacy Settings:
Confirm that your privacy settings allow communication with everyone. Navigate to Settings > Account > Privacy & online safety > Xbox privacy > View details & customize, and check the options related to voice chat.

4. Unmute Other Participants:
If you're trying to chat with specific users, make sure they are not muted on your end and that you aren't blocked from talking to them.

5. Restart Your Console or App:
Sometimes, simply restarting your Xbox console or the Xbox application may resolve connectivity or audio issues.

6. Update Xbox App:
Make sure that your Xbox app is updated to the latest version. Updates often include fixes for known issues.

7. Uninstall and Reinstall the Xbox App:
If problems persist, consider uninstalling the Xbox app from your device and then reinstalling it again.

8. Clear Cache:
If you're using a browser, clearing the browser cache may help resolve any issues with the app. You can do this from your browser's settings.

9. Check Windows Sound Settings:
Go to Windows Sound settings (right-click on the speaker icon in the system tray) and ensure that your input/output devices are set correctly for the Xbox app.

10. Consult Xbox Support:
If none of the above steps work, visit the Xbox Support page for additional troubleshooting options related to party audio - learn more.

By following these steps, you should be able to resolve the issue with not being able to chat on the Xbox browser. If the issue continues, consider seeking additional support from Xbox Forums or community pages.