Unable to connect stereo headset to elite controller.

What kind of controller are you using?

If a regular controller are you using the stereo headset adapter? If so all the control settings are on it, not the guide.

If an Elite controller are you using the stereo adapter or jacking your headset right in the 3.5 mm jack?

Yes, the headset adapter is compatible with all xbox one controller including your elite controller series one

"No matter what kind of Xbox controller you have, you can connect the Xbox One Stereo Headset Adapter to your controller by plugging it into the rectangular expansion port on the bottom of
your controller"

The old Xbox One controller only featured an expansion port, newer controllers including the elite controller also feature a 3.5mm input where you can connect 3.5mm cables into.

So if your headset just requires a 3.5mm input then you can connect it without the stereo adapter if you have a newer model of the Xbox One controllers

When you say it connects directly to the controller, do you mean you are not using the stereo headset adaptor:

www.xbox.com/.../stereo-headset-adapter

If your Xbox One stereo Headset is not working properly, check the following.

Make sure the Controller software has been upgraded to support the stereo Headset adapter
Make sure that new batteries are inserted into the controller. When the batteries have a low charge level, some features of the controller such as audio and rumble are deactivated to optimize the remaining charge.
Make sure that the headset adapter is securely connected to the controller and that the 3.5 mm cable from the stereo headset is securely connected to the headset adapter. You can perform this verification by pressing the voice mute button and checking
that the LED lights up.
To see if your Xbox One stereo Headset is working, try it with another device, such as a portable computer. If it doesn't work, you need to replace it. To order a replacement headset, visit the Xbox online Help Center.
If possible, try using the stereo headset and the stereo headset adapter with a different controller. If the headset is working with this second controller, try updating the first controller again. If the problem is still not resolved, you must replace
the controller. To order a replacement headset, visit the Xbox online Help Center.