Ensure "Enable Power Nap" is disabled if it conflicts with background processes. Understanding the intricate relationship between macOS settings and hardware sensors is the first step toward resolving this issue.
Troubleshooting Keyboard Light Issues After a macOS Update
If the backlight is set to the lowest level, it may appear off in bright environments, creating the illusion of a complete failure. Software Updates and System Management Operating system glitches are a common culprit behind peripheral malfunctions.
Additionally, newer MacBook Pro models offer granular control, allowing users to adjust brightness levels using the F5 and F6 keys. Review the "Turn display off after" slider and increase the time duration.
Troubleshooting MacBook Keyboard Light After Software Update
Hardware Diagnostics and Physical Inspection. A corrupted preference file or a conflict within the macOS kernel can disrupt the communication between the keyboard and the logic board.
More About Why does my macbook keyboard not light up
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