How Do I Find My Lost Xbox Controller

Hello Jackson, this is Manuela. I'm an Independent Advisor and community user like you, ready to assist with this.
Not a Microsoft employee.

I’m afraid to say that’s not possible to track an Xbox controller by using your mobile phone.

try headset for cortana.. if controller is turned off.. then you have to find it manual only..

That will only work if the controller is switched on, if it's turned off, then it wont work.

f you've lost your controller, the Xbox One
will now allow you to locate it through the console. Asking the console to locate it through Kinect will activate the vibration sensor in the controller, and while that's not much
it could be just enough noise and vibration to help you find your missing accessory.

Try doing that with Cortana.

If your battery in the controller dead then your outta luck on any app sending it a vibration.