So you did type the name in that box which says Signature? But isn't the typed name sufficient as above the box it says "I agree that by typing my name, I am electronically signing my application"
This same issue happened to us when we submitted January 20th 2020 and it was returned February 24th 2020.
Instructions in the checklist says print name and sign. But the form clearly says by printing name I electronically sign this form.
I just hope the will remove that clause from the form and simply says sign