What should I do if the printer is not connecting to the wireless network?
Verify that no network cable is connected, as the printer cannot connect to a wireless network when a network cable is attached. Ensure the printer and wireless router are both turned on and that the printer is within 30 meters (100 feet) of the wireless access point. Also verify that the computer and printer are connected to the same wireless network, and try restarting the wireless router. (Page 11)
From the official HP Laserjet Pro Mfp M127 manual, page 11
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