The groups I have set up are not visible in the self-enrolment tool. What should I do?
Nothing, it is how the tools work, unfortunately. The standard Brightspace Group tool (found in the Nav-bar under Collaboration > Groups) allows you to configure groups (incl. self-enrollment) in a more limited manner, for instance, you cannot use start dates for the enrollments. The standard group tool also does not support waitlists. The TU Delft Self-enrollment tool runs on a server hosted at the university, which means that the categories, groups and enrollments do not exist in Brightspace until they are pushed. This also means that the tool is thus not able to pull up and 'take over' any categories and groups that you might have manually configured in Brightspace Groups.