Also, make sure the number of groups you create correspond exactly to the number of sections in the course.
In higher education in Norway, our SIS (student information system), FS, will always create one "main" section, containing all students in the course in addition to the sections containing the smaller number of students, meaning each student will be present in at least two sections.
If this is the case, you must temporarily cross-list this (or these) sections OUT of the course temporarily, then create your group set, then un-crosslist the section again.
We've done this in a course with 2000 students and 200 sections/groups, so you should be fine 😉
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