Hello Everyone who is as frustrated by this issue as I was,
So the solution to this problem is far simpler than the Canon people would have you believe. These Canon printers have very odd communication issues if you have multiple users on one PC. I had a very similar issue in just connecting to my wireless network after I purchased a wireless extender. If your PC is on the main network but your printer is on the extender then it fails to communicate as there are conflicting MAC addresses, IP addresses, etc.
The same sort of issues result if you are trying to scan or print from one user while the printer unit itself is trying to communicate with another user. For example;
The PC is on user: "JOHN" and on the printer unit it says at the top of the display: PC LUCY then the error will persist because the printer/scanner is trying to send information to the user: "LUCY" but that user is not currently logged on so the information hits a gap and causes the error
The solution: at the bottom of the display there should be an option that says; "Save/Forward". Click that button and choose PC then select the correct user (in this example "JOHN") and then try scanning again.
I tried virtuallly everything else including, re-installing drivers, diagnosing the printer/scanner, even tried the complex file path cut and paste solution that one Canon rep had suggested in this forum and nothing. As soon as I changed this very simple setting it worked like a charm with no problems.
I hope this helps everyone who has probably already given up and bought a different brand of printer/scanner out of spite. To the people at Canon I just have to ask, what the are they paying you for?
