To connect your Sony WH H900N headphones to Windows 11, you will need to ensure that your Bluetooth is enabled on your device. First, open the Settings app from the Start Menu. Then, in the Settings app, select Devices. On the left side panel, you should see a Bluetooth option. Make sure it is turned on.
Once Bluetooth is enabled, you need to pair your device with your computer. To do this, you will need to locate your Sony WH H900N headphones and select them to pair with. Once they have been successfully paired, they should be visible in the Bluetooth settings on your computer.
Finally, you need to configure your headphones as the default audio output device. To do this, right-click the speaker icon in the taskbar and select Playback Devices. In the Playback Devices window, select your Sony WH H900N headphones and then click the Set Default button. You should now be able to use your headphones with Windows 11.