HP updated its firmware (version 1910AR) for all printers using HP 952xl, 902xl, 972A/X, 976Y, 981A/X/Y inkjets on April 9, 2019. If you have your printer setting such that it is allowed to upgrade the firmware from HP via the internet (or if you accepted such a firmware update request from HP), you have essentially allowed HP to lock you out from using remanufactured / 3rd party cartridges. All third party cartridges with an old chip version won't work on the printer with updated firmware.
As of May 13, 2019 - we have released a V5 chip for HP 952xl, 902xl, 972A/X, 976Y, 981A/X/Y inkjets that will work on all these HP models and circumvent the firmware update issue. If you have an earlier version cartridge, please order our new cartridges or contact us for a replacement for a new cartridge with the V5 chip version.