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.
Huawei P10 review
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.