Keyboard lights gone,can't adjust anymore useing f keys

Hi all,new to the the mac sceen.ok my keyboard buttons when pushed give me the symbol of a circle with a slash threw it telling me I can't adjust level of brightness,I have since I got it.now this morning I can't adjust it or even turn on any keyboard lights,where did they go? Help anyone.

Yes. If the ambient light sensors detect a high enough light level in the machine's surroundings, the keyboard backlight can't be lit, even manually.

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