You are unable to view learners enrolled in a course.
The Learners tab of a course does not display any learner enrolled. However, if you generate a report, you can view the enrolled learners in the report.
No learner displayed
If a learner is enrolled through a higher Learning Object (Learning Program or Certification), then the learner will be visible on the higher Learning Object’s Learner tab. The learner will not be searchable under the course’s Learners tab.
How to view which Higher Learning Object the Learner is enrolled to?
You can check this information on the Learning Transcript report. To generate a Learner Transcript, follow the steps below:
Log in as an Administrator.
Click Reports > Custom Reports > Excel Reports > Learner Transcript.
Enter the name of the Learner and specify the Date range.
Expand the section Advanced Options and select the option Enable module level information.
On the Learner Transcript, you can view which higher Learning Object the learner is enrolled through.