In JIRA and JIRA core you goto administration -> user management -> (enter your admin password) -> search for the username -> click on the 3 dots after the name -> select "delete user" -> confirm -> done.
If you are not an admin, you have to ask your admin.
If you aginst all odds are on a cloud instance you need to talk to support.atlassian.com, and ask them to delete it via support.atlassian.com
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