If you were on a stable network but could not use the microphone to voice chat with your teammates, Then please refer to the following solutions:

1) Please ensure that the game has been granted access to the microphone on your device, then restart the game.
2) Please ensure that the volume in the Audio settings are turned up and the right chat channel is selected.

Kind Reminder: For public policy matters, please send an email to policy@proximabeta.com