1 headset 2 xbox

1. Buy Headset Adapter (www.xbox.com/.../stereo-headset-adapter)

2. No

Turtle beach is will releasing headsets for xbox one. I believe the listed date is 2-1-14... They have to wait for Microsoft to release the headset adapter.
www.turtlebeach.com/.../xbox-one

there are 2 places to check for the Headset volume settings.

there is a Chat Mixer which sets up the mix of game and chat volume balance and there are the audio settings.

do both headsets work on the Xbox that 1 works on?

if they do, pair the controller from the Xbox they don't work on with the Xbox they do work on and see if both headsets work on that controller.

if they do try both controllers and headsets on the Xbox they weren't working on.

if they don't then it should help narrow it down to the Xbox, 1 of the controllers or 1 of the headsets.

you may have to get a Headset Adapter https://beta.support.xbox.com/help/hardware-network/accessories/stereo-headset-set-up-troubleshoot
or see if you can get a repair/replacement on the faulty item.

1) yeah it's meant to be like that, the light shows that it is connected to the headset

2) not too sure but the headset works with my PC so I don't know why it isn't working with my xbox

they wont be on sale till 1-2 months after the xb1 headsets are released as there pushing sales of the new headsets