Blackboard courses are uploaded into the server as unavailable by default. This means that student enrollments do not populate into course section until the course has been set as available.
How do I do this? Very simple solution!
From the course, click on the 'Customization' link under the control panel. Choose 'Properties' and then under step #3 (Set Availability), change 'Make Course Available' to YES. Click on Submit.
Student enrollments will populate to the course within 24 business hours.