Xbox Wireless Adapter for Windows Pair button cover missing

Thanks for the response but as I haved stated my controllers and adapter work fine but the adapters pair button has fallen off by itself and can't press it.

I understand. This procedure must be done by a repair technician. Take it to a licensed service center.

Hello, my name is Fernando, an independent consultant. Hope you are doing great. I will be more than happy to help you with your query today.

The link below has information that may help in your case.

https://support.xbox.com/en-US/help/hardware-network/controller/wireless-controller-solution

(Note) The link being shared is in English and may require translation software to read the page content.

Hope I helped, see you soon!

Hi,

If you’re using the Xbox Wireless Adapter for Windows 10:

1. Turn on your PC and sign in.
   
2. Plug the Xbox Wireless Adapter for Windows into your PC. For more info, see
   Set up the Xbox Wireless Adapter for Windows.
   
3. Turn on your controller by pressing the
   Xboxbutton. When you turn on the controller, the
   Xbox button will start flashing.
   
4. Press and hold the
   Pair button on the Xbox Wireless Adapter. A small light will flash for several seconds.
   
5. Press and hold the
   Pairbutton on the top of the controller (the raised button). The
   Xbox button on the controller will flash more rapidly – this means your controller is searching for the Xbox Wireless Adapter.
   When connected, the Xbox button on the controller will stay lit.
   

Thanks Chirs. I followed the two methods shown below to pair the Elite Wireless Controller. However, it does not show up under Windows 10. What shall I do? By "push the button on the Xbox Wireless Adapter", do they mean pressing the end of the usb adpater?
My adapter is the smaller black version.

https://support.xbox.com/en-US/xbox-on-windows/accessories/xbox-wireless-adapter-for-windows-setup