Does the HP LaserJet MFP M139e-M142e support 5 GHz Wi-Fi connections?
No, the printer only supports 2.4 GHz Wi-Fi connections. If your network is set to 5 GHz only, you will need to switch to a 2.4 GHz network to connect the printer. (Page 3)
From the official HP Laserjet Mfp M139e M142e Printer manual, page 3
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