Please check:
- scan account’s access permission.
- whether enable SMBv1, which Server 2016 has disabled by default.
Enabling SMBv1 by the following powershell command”
Enable-WindowsOptionalFeature -Online -FeatureName smb1protocol
If that works, I suggest updating the firmware on the scanner (what model?), disabling SMBv1, and trying again.
Disable-WindowsOptionalFeature -Online -FeatureName smb1protocol
Source:
https://community.spiceworks.com/topic/2065931-hp-scan-to-folder-stopped-working
Also check this article:
https://www.rizonesoft.com/solve-network-scan-to-folder-not-working/
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