How To Fix AirPort Software Can’t Detect AirPort Express Issue?

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If the AirPort Software Can’t Detect your AirPort Express
Make sure that the Mac you’re using has Wi-Fi. Use the Wi-Fi status menu on the menu bar to make sure Wi-Fi is turned on.
If you’re using a Windows computer, make sure the wireless card or adapter is installed correctly. To check the connection, see the documentation that came with your computer.

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