Thanks Don! This had me stumped for hours!
There is an easier way to use data extracts and it can be set up in composer. Go to the field you want to use as a data extract source. Then in the properties for that field go to the data model tab then under 'TM Data Extract Name' at the bottom select 'specify name' from the drop down and give it a data extract a name. Next time you import the form into composer this data extract will be set up and ready to be used with submissions