Sync button stuck on controller

I think I have found the issue - one of my controllers is broken and the right trigger is stuck on. It's also missing the sync button. Is there any way I can unpair the controller without the sync button?

Hello, was it an official Xbox controller? IF so if still under warranty it would be repaired through Xbox's warranty by registering the serial number found behind the batteries. If not then you would have to know what that controllers repair policy is.

Hi

If the sync button on your controller is not working/stuck and something is loose inside the controller then the recommended course of action is to return the controller to
Microsoft for service or to purchase a replacement controller.

Sync the Controller:
To sync a wireless controller with your Xbox, follow these steps:

Press the Xbox button on the controller to turn it on.
Press and hold the small sync button on the front of the Xbox Series X console (located near the USB port).
While holding the sync button on the console, press and hold the sync button on the controller (located on the top near the Xbox button).
Release both sync buttons when the controller's Xbox button starts flashing. The controller should now be synced with the console.

ANSWER/FIX:

I have successfully got a replacement and it's VERY easy. You go to the support then click on the virtual agent (make sure you signed in to your Microsoft account before) and type your problem and keep clicking no. It should say talk to a real person or
a calling option and you pick the option that you want, tell them the problem and then they take it from there. It takes about 10 days for shipping and support takes about 10-30 min (depending on how many options they give you)