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HP Officejet Pro 8600 Plus e-All-in-One Printer - N911g

I have an HP Officejet Pro 8600 Plus e-All-in-One Printer N911g. I have just gotten a T-Mobile 5G Gateway router set up with 2 networks: one with 2.4 GHz and 5 GHz (dual band) and one with just 2.4 GHz - WPA security. When I attempt to connect the printer to the 2.4 GHz network, it fails with the issue "MAC address filtering may be enabled on your wireless router". IT IS NOT.

I havereset this network several times, updated drivers, ensured the security settings are proper, rebooted the computer several times. I have connected several other devices to this network (iphone / ipad / desktop) withjout issue so this is a tad frustrating. Is there 

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