My XPS 15 2-in-1 9575 no longer changes brightness using Fn up and down arrows or from the Display settings menu. I've tried updating the drivers for my graphics card from Intel and using Windows update. My Windows 10 version is 20H2 (OS Build 19042.804). Any help with this?

P.S. Night light is working properly, so I can us that to dim my display if necessary.