I spent about three hours trying to fix this after I got a new laptop - tried every solution I could find on the net. Finally, the only thing that worked was adding the "Add_Pin_to_Quick_access_to_context_menu" regedit key to the registry and then removing the key with "Remove_Pin_to_Quick_access_from_context_menu" from the registry. I then had to run the "Add_Pin..." regedit again. No idea what/why/how and I am pretty decent at doing my own self taught IT for many years.
Basically, download the two regedit keys, run the first one, run the second one, run the first one. Suddenly quick access shows up at the top of my home screen in explorer. Gods, what a waste of an afternoon...