I am going through the steps and the first thing I noticed is that if I try to update the drivers directly from the printer, I get the following error: "Server connection error. Unable to connect to Web Services. Confim internet access and try again."
I have confirmed that I have my internet is connected to the wifi because I can see the printer in the list of printers available to print from my computer. I tried to download the drivers to my computer but I don't see my OS (I have 10.14.2 and the latest one available is 10.12 so I didn't update.
I will continue following your instructions and let you know what I find. Thanks!