Documentation:Blackboard Learn Support Resources/Assignment Feedback
If a student can't see the assignment feedback that you send through the Grade Center in Blackboard, please check the following settings.
Check that the assignment column is visible in the Grade Center.
When a column has a dark circle with a salmon coloured line through it as in the image below, the column will not be visible to students when they look for your feedback in 'My Grades'.
To correct this problem, click the dropdown menu in the column header and choose 'Show/Hide to Users'.