Hello Mario,
Welcome to the Canon Forums and thanks for your post!
The MF Network Scan Utility needs to be running and the scanner must be selected in it.
If you still have issues, try installing a patch for the issue. Please click HERE to go to the Color imageCLASS MF8080Cw Drivers & Download website. Select Windows 8.1 or Windows 8.1 (x64) from the Operating System drop down menu, if it does not automatically recognize it. Click on SELECT button next to the [Windows 64-bit] Patch for Network Scan, USB Scan (Windows 8/8.1/10). Please read supporting documents then click in DOWNLOAD button to download the file MF8000CUSBScanPatchW64EN.exe.
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