Printer Wireless, Networking & Internet

I just grab an HP printer from Goodwill. I cleaned it and tried to set up, and after downloading HP's app, I realized that this printer was already claimed by the previous owner, and they didn't sign out when giving it to Goodwill. The printer refuse to print anything but a few testing page due to its registration with the previous owner, but its hardware appeared fine. The WiFi worked, and I managed to hooked it up to my home network.

After some googling and browsing through HP's documentation on it, I found out that the previous owner used Instant Ink subscription, and they stopped enrolling in the program, thus the cartridges came with it are no longer functional (and they are out-of-ink anyway). Some forum posts and documentations suggest that I need a "printer claim code" to get it working, and to get the code, I need the printer to physically print out an "info page". 

So I purchased a cartridge (since the ones came with it ran out of ink), and tried to print it. All other diagnostic pages did successfully printed - the new cartridge worked and it proved the printer itself worked fine - but I cannot get the "web service info page" printed. I tried several different browsers, reboot the printer, remove and rejoin the "web service," but non of them worked. The printer doesn't even try, it just appears as it never received the task to print it. 

Another google took me to this page, which suggests that I can try by playing with the "ePrint icon", and more specific to my model, I can press the "Web Service" and "Information" buttons at the same time. Again, those never worked for me. In this case, pressing both buttons will make the light for power button blink a few times, but the printer still doesn't want to print anything.

Now I'm stuck here. I also found some posts suggesting that even if I got the claim code, I won't be able to reclaim this printer as myself. I have wasted enough time on this printer, and I'm wondering is there anything I could do next, or should I make another post saying "Never buy used HP printer from Goodwill or if you don't know the previous owner."