I had to add the following line to the end of the file after running the Quickbooks generated W2REPORT.TXT:
RF XXXXXXXXX
There should be 5 spaces after RF and the X's must be replaced with the number of W-2's being submitted in the file with leading zero's. In my case I had 21 W-2's so: XXXXXXXXX = [removed]
Be sure not to add anything after that (spaces, carriage return <enter>, etc)
