Can you go to Windows Settings > BLuetooth & devices > Devices.
Scroll down a bit, in the "Device settings" section, do you see "Use LE Audio when available", if so, make sure it is turned on. Then try to pair. You might need to go to your phone's bluetooth settings and totally forget/remove it first.
If this LE audio option is not visiable, it means your Windows device doesn't support it. Further instruction: https://support.microsoft.com/windows/check-if-a-windows-11-device-supports-bluetooth-low-energy-audio-2b79c085-0353-4467-8306-ebb2657a91de