Let me take a moment to thank you for posting on the HP Support Forums.
I understand that you have installed new ink cartridge and the HP Rewards link does not work. I'll be glad to check this for you.
I did some research and found that the HP Rewards Program ended on 31st Jul 2017. The Reward redemption was available till 15th August 2017. We also urge you to upgrade your printer driver after 15th Aug 2017 to see other exciting promotions and programs that HP has in store for you. To upgrade your driver, please click on the link below: https://support.hp.com/my-en/drivers. Source of information: http://bit.ly/2fhP4Md.
Hoe this answers your question. Keep me posted for any further questions. Cheers! 🙂