I am having a similar problem; however, sometimes I get an editable .docx file and sometimes I don't. Not sure of why that is happening. In all cases, I am using a .pdf document that I scanned using an HP Envy 7640 printer/scanner with Windows 10 Home, latest build. I cannot see any difference in the settings/options.
Atleast I know it can work sometimes; just need to know how to make it work all the time.