My Rift S does not work and has the amber light on 24/7 whenever it is plugged in. The amber light will not go away even while wearing the headset and shows the 3 loading dots. The yellow light will only go away and be replaced by the white light as soon as I press "Device setup" and it will go perfectly fine and say the sensors are detected but as soon as I exit the setup it will go back to the amber light.
That's because the amber light means it's on standby. Their software doesn't allow you to shut the thing off completely. For that, you need to Use Oculus Tray Tool or a script to kill the process, then the amber light goes off. The only reason I do this is because any bump turns my controllers back on and kills the battery.