Here's my scenario. I have an Assignment set as an external tool using one of Pearson's MyLab products. The assignment is set to receive grades from Pearson manually when I sync my course with Pearson. The Gradebook appears to populate properly. My assignment is worth 1 point in Canvas, and on Sync, students that completed the assignment show with 1 point, while those that have not completed teh Pearson assignments remain as 'blank' in the Canvas Gradebook.
Now, when I go to Message Students Who, if I choose "Haven't Submitted Yet", I get the entire course listed, while if I choose "Haven't been Graded", I get just the students that do not have '1's in the column.
Is there a separate "submissions" flag that is independent from the score, is this flag unique to External Tool Assignments? Is there a way via Pearson's sync mechanism that they can set the Submitted flag along with setting a grade, so as to avoid this confusion?