When an instructor uses the "Message Students Who" function in the grade book for online submissions or external tool (publisher) assignments and selects "Haven't submitted yet," Canvas will identify students even if they have a grade from the external source or have a grade that was manually entered by the instructor. Instructure tech support advised me that this is expected behaviour since Canvas is only looking for on-line submissions. Canvas should look at the status of online submissions AND grading when selecting students who meet these criteria. Instructors do accept on-paper submissions in lieu of on-line submissions and many instructors use external tool generated assignments.
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