I assume this works the same way in Ultra as it does in the Original Experience. We should be able to relabel a course's ID, such as via the SIS Integration Framework (not necessarily in the GUI).
We can change the external course key, via the SIS IF, but not the course ID. I've suggested this a few times the past five years or so. In those cases I've been told that it can't be done, because Xythos (the content management system for Blackboard) does not support renaming folders at this level (for which relabeling a course ID would equate to renaming a folder).
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