There are 2 possible reasons:
You have not yet granted access to students for the new semester. Refer to User guide on Moodle for instructor- My eLearning tab.
- There may be a delay in obtaining enrollment records from Registry. For undergraduate or research postgraduate students, it takes 1 day to activate students' access to your Moodle course after enrollment. For taught postgraduate students and have enrolled in your course by filling in paper forms, please send your enrollment data to the Registry via Faculty Office as soon as possible. Students' access to this Moodle course will be activated 1 day after the Registry has entered enrollment record into their database.