Where are you attempt to scan? From a computer or mobile device?
If using a mobile device, as long as your PIXMA TR7020a is connected to your network, the mobile device can use the Canon PRINT Inkjet/ SELPHY app to scan.
If you are using a computer, what operating system is installed on it?
I have a typical Lenovo laptop running Win 10. I can print just fine, but I see nothing in the Menu regarding scanning. The online manual has all sorts of information regarding how to scan, but I can't find a reliable source for the software to load on my laptop. The Microsoft download functionality is dismal and won't download. What am I doing wrong?