If your Windows Defender throws up an error message saying, “Items skipped during the scan then the cause could be that you added an Exclusion to your Scan settings or if you have network scanning disabled on your system. If you face this issue, you may need need to enable Network scanning in Windows Defender on Windows 10 to resolve the problem.
The error message appears during both quick and full scans.
Enable Network scanning in Windows Defender
There are three ways to disable or enable Network scanning in Windows Defender on Windows 10. Each of these will allow network scanning.
Group Policy Method
Registry Editor Method
Depending on the Windows version, and your privileges, you can choose one of them.
1] PowerShell Method
Launch PowerShell with admin privileges