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You should initiate the scanning process directly from computer. There are many ways to Scan a document. First method is, click on Start menu and look for an app named Scan. Open it and use it to Scan.
If you don't see Scan app, then type Scan at the windows search box and this will show Scan app. Open it and use it to scan. If you don't have it, then you can get it from here --> https://www.microsoft.com/en-in/store/p/windows-scan/9wzdncrfj3pv
Another method is (if you have installed the disc came with it), search Canon Scan or IJ Scan or ScanGear and if it finds anything, open it and use it to scan.
If you don't have that app, then go to this website --> https://www.usa.canon.com/internet/portal/us/home/support/details/printers/black-and-white-laser/mf227dw
Click DRIVERS AND DOWNLOADS. Then download and install the following drivers/software
[Windows 64bit] imageCLASS MF229dw/MF227dw MFDrivers (UFR II / FAX / ScanGear)
[Windows 32-bit & 64-bit] Patch for Network Scan, USB Scan
After installing it, you will see the Canon Scan or IJ Scan or Scan Gear app which will allow you to scan.
If you have any difficulty on following the steps above, please let me know and I will continue to help you