Question Can't Detect Input Source While Using XR Device Simulator

Hi. I am currently developing a simple app for an hackaton and I currently don't have access to a VR device. Therefore, I tried using XR Device Simulator which works. I can look around and move the right hand, left hand, the head etc. with using my mouse and keyboard. However, when I try to detect for example if I am pressing the trigger button wih my right hand, I can't. Here is the code:

Code (CSharp):

1. void Update()
2.     {     UnityEngine.XR.Interaction.Toolkit.InputHelpers.IsPressed(InputDevices.GetDeviceAtXRNode(input_source), input_button, out bool isPressed, input_treshold);
3. }

From other thest lines I realised that "UnityEngine.XR.InputDevices.GetDevices" returns null which I think means my mouse and keyboard doesn't count as a "XR Input Device". How can I reach them?

Thank you.