ASUS used several different vendors for the X550 series. To get the right driver, you first need to know which chip is inside your laptop:
Let me know your exact X550L submodel (check the sticker on the bottom) if you need a direct driver link. asus x550l bluetooth driver windows 11
only lists drivers up to Windows 10, try these methods in order: Windows Update (Preferred) ASUS used several different vendors for the X550 series