if some users leave the company and they have Jira-Issues as reporter or Assignee or made comments within some Tickets the usernames get "unlinked" because they are unknown.
I tried to made a JQL like "project = xyz and reporter = my-unknown-user" but "my-unknown-user" is unknown and the filter doesn't work.
Is there any way to get all tickets where this unknown user was involved?
Regarding the app. structure, JIRA is related to the username account and not the ID. So, just try to create another account using the same username, but using the internal directory (not LDAP).
After, just try to find the issues using the Issue Navigator and Bulk Edit the issues. Perhaps the following links could be useful to understand a little bit:
In case of further assistance, try to raise a new support ticket.
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