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I just had my MacBook battery replaced and they also changed the top case in the process. Now, when I press the "volume" keys or the "light" keys (basically any "function" key), none of them are working. They "lower volume" key (aka F11), removes all windows to show the desktop. I didn't change any keyboard configurations and haven't noticed anything strange when I check them in the "Settings / Keyboard".
MacBook Pro 13″, macOS 11.2
Problem solved at the Apple Store (they had forgotten to run one of the setting tests when replacing the top case).
Problem solved at the Apple Store (they had forgotten to run one of the setting tests when replacing the top case).
function keys not working
