As you've noticed, you can't edit the directory which contains the user you are logged in with. A workaround is to create an internal directory with a single admin user as a member of the necessary jira-user and jira-administrator groups. Once created, enable the directory, sign in as the internal admin at which point you should be able to edit your AD directory. When you're done, log out and log back in with your AD credentials nd disable/delete the internal directory.
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