Cause: The Bluetooth function may not be enabled. The device may be damaged, resulting in the inability to perform Bluetooth pairing; It may be that the Bluetooth device has run out of power and can be charged for a while before pairing.
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Apple second control keyboard pairing method: Use the lightning to USB cable to connect the keyboard and the computer, need to ensure that the keyboard power key has been turned on, then open the system preferences page on the Mac computer, turn on the Bluetooth function, and then pair with the keyboard, you can unplug the cable after successful pairing, with high transmission efficiency and high security advantages
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First check if the keyboard is locked. If so, press Fn F11 to unlock it or press CapsLock. I saw a light go off in the upper right corner and it went back to normal.