Like other gaming consoles, SHIELD TV does not support mic on Bluetooth headsets due to latency/audio issues with the standard Bluetooth protocol. If you are not getting any audio from your microphone in GeForce Now but it works on your PC or Mac, please make sure you are using a supported frequency. If you are using a Bluetooth gaming headset on PC and Mac, please read this Knowledge Base article to optimize your gaming audio.
To use Mic, make sure you have the latest PC, Mac, and NVIDIA Games App (SHIELD) installed. Now you can voice chat with your friends, or foes, in game during your epic battles. Yes, the Mac, PC, and SHIELD apps support in-game mic.