HP are notoriously flaky when scanning.
Are you trying to scan wirelessly?
I no longer use HP (because of scanning difficulties!) but always found, on the few occasions when it worked, that an ethernet (not usb) connection was needed.
Alienware 17 R4 2017 review
These brilliant Lego posters show just what children's imaginations are capable of
Mac power user tips and hidden tricks
Comment réinitialiser votre PC, ordinateur portable ou tablette Windows ?