I see that you have issues with adding the printer to the new instant ink account, follow the steps below-
Press the HP ePrint icon on your control panel display and select Remove Web Services. Follow the on-screen instructions to remove Web Services, press the HP ePrint icon again, and then follow the prompts to re-enable Web Services. A new Printer Info Page titled "Congratulations" prints with a new claim code. Try to claim the printer again using the new claim code. If the page does not print, see the troubleshooting item "The printer info page did not print". If you are unable to find the HP ePrint icon on your control panel display, see "Cannot find HP ePrint icon on printer control panel display".
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