HP Officejet Pro 8710 Printer Offline
Uninstall printer HP Officejet Pro 8710
Reboot PC
Download driver from HP website https://support.hp.com/gb-en/drivers/selfservice/closure/hp-officejet-pro-8710-all-in-one-printer-series/7902014
Reinstall printer
Follow on screen instructions
It should resolve the problem