Another reason could be if you have set the game to send control to the player ... for you explaining how to change the Xbox controller to Player 1 on Windows PC. Before you proceed to change ...

This article shows you two ways to connect several generations of Xbox controller to both consoles or Windows PCs. Instructions apply to Windows 10 and up and Xbox 360 consoles and later.

Each subsequent controller (up to four) connected to your computer is assigned an additional quadrant. To view your controller quadrant and battery status on the screen, press the Xbox Guide button.