How can I enable LE Audio on Windows 11 with my new headphones?

I'm running Windows 11 (24H2) on an AMD Ryzen 7 5800X3D with a B550 chipset. I've just bought a pair of Sony WH-1000XM6 headphones, which support Bluetooth LE audio. I also installed a new WiFi/Bluetooth combo card, the MSI HERALD-BE NCM-865, which uses the Qualcomm FastConnect 7800 chipset that supports LE audio according to Qualcomm's site. However, I'm struggling to find the option to enable "Use LE audio when available" as instructed by Microsoft. I've reinstalled Windows and ensured all my drivers are up to date, but still no luck. Can anyone help me out?