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Deleting a user permanently removes their profile and all associated data. This means that they cannot log in, and there is no way to recover their data so only do so if you are 100% sure. If you just wish to deactivate the user (retaining their information, learner data etc.) then follow the steps to deactivate a user here
How do I delete a user?
Find the user you wish to delete, either by searching or through the people logs.
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