I need to pull all of the tickets an old employee worked on while at the company. I have not deleted the user, but simply blocked their access. When I search their name in Advanced search I get this error, "The value '...' does not exist for the field 'assignee'. There must be historical information stored in Jira, so I don't understand why I can't look up previous work from this user. I have also tried filtering it down to a specific project I know they worked on, but it's still not working. Assignee was functions also do not work.
For a single user, the assignee field only works for active users. You can search for where the Assignee is any inactive user using:
assignee in inactiveUsers()
If you want to search for just one user though, there is an alternative option. You'll need to be a Site Admin to set this up:
assignee in membersOf("Inactive User")
That will give you the results for one specific inactive user.