If you wish to add the 123.hp.com/setup printer to your list, you have to use the printers & Scanners preference. Most of the time, as you try to add a printer to the MAC operating system, then installing the driver is very important and the latest software version shall get downloaded in the process. In case if the printer is enabled with the Airprint feature, it will be compatible with the MAC OS. So you can call the support team number +1-800-237-0201 in case of the issues you might face while adding the HP printer via 123.hp.com/setup.
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