Macbook keyboard backlight not working on catalina
My Macbook Pro (15-inch, 2018, Touchbar), worked perfectly until I updated from Mojave to Catalina. The keyboard backlight does not light up. It worked when I downgraded to Mojave at a point. I am back to Catalina and it doesn't light up. The keyboard backlight symbols appear on the touchbar but not on the screen when pressed. I find it difficult using my mac in the dark.
I have reset PRAM/NVRAM and SMC and format the PC but to no avail.
Any help would be most appreciated. Thanks.
MacBook Pro 15”, macOS 10.15