Students are currently not allowed to self-enroll into a course session on the same day as the session's scheduled date. These are intentionally blocked so that instructors and presenters are aware in advance of who will be attending their session prior to the start time.
As a workaround, Learning Authors and Learning Administrators will need to manually enroll any necessary students to this session if they're looking to give students access on the same day it's also taking place.
If you would like to request this functionality be implemented in a future release, we recommend visiting our Product Suggestion forum. To learn how you can submit your own suggestion, please refer to the article below:
Relevant Articles and Training Videos:
If you have any additional questions, please contact Support