Wireless XBOX 360 controller doesn't want to connect to the PC adapter

Is the controller a wireless controller or wired? If it is wireless, how are you connecting it? If by using the play & charge kit, then the Xbox 360 controller will not work, as the cable is only recognized on PC for charging only. You need to use a Xbox
360 Wireless adapter for PC to connect a wireless Xbox 360 controller to your PC.

Is this an Xbox One controller, or an Xbox 360 controller? If it's an Xbox One controller, are you connecting wirelessly to the PC via Bluetooth, or with the Xbox Wireless Adapter?

Xbox one controller with an xbox wireless adapter

To connect a Xbox 360 wireless controller to your PC you need the Xbox 360 wireless controller adapter for Windows. https://bit.ly/3e2eUTF

To connect a Xbox 360 wired controller to your PC, just plug in the USB plug into the USB socket on your PC.

Hello, I hope you are well.

Please check these steps below.

What you are seeing with the LEDs is an indication that the Xbox 360 Explorer controller is entering pairing mode, not working mode. In order for the controller to function on your PC, you must first pair it with the Xbox 360 Wireless Adapter.

Steps to pair the controller with the wireless adapter:

Connect the wireless adapter: Connect the Xbox 360 Wireless Adapter to a USB port on your PC.

Press the pairing button on the adapter: On the wireless adapter, there is a small button (usually near the USB port). Press and hold this button for a few seconds. The LED on the adapter should start blinking.

Turn on the controller: Press the Xbox button in the center of the controller to turn it on.

Is this an Xbox One controller, or an Xbox 360 controller? If it's an Xbox One controller, are you connecting wirelessly to the PC via Bluetooth, or with the Xbox Wireless Adapter?