Macbook Pro Keyboard Backlight Not Working

My keyboard doesn't light up at all the moment I log into my mac. When I go into settings, the keyboard brightness options don't even exist anymore. Additionally, using the control center, touch bar, and etc has no effect on it as well. The control center just automatically drags it back to 0. However, if I restart it, the keyboard will light up again on the login screen. But once I log in, it shuts off again.

I've already tried SMC reset, safe mode, and etc. Any idea on how to fix it?

Thanks.