How do I print from a mobile device?
The LaserJet Pro MFP series does not support Wi-Fi Direct or AirPrint connections directly to print from portable devices. Instead, connect via USB cable and use software on a computer to facilitate printing. Refer to additional guides for setting up wireless sharing through networked computers (Page 6).
From the official HP Laserjet Pro Mfp M28 M31 Printer manual, page 6
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