I have just imported our old fault tracking data into JIRA, and ended up with some usernames that I need to make unselectable as assignees (people who have left).
To do this, I removed them from the groups to which they were assigned.
However, there are 3 for which this does not work.
I found a possible solution in the KB here: https://confluence.atlassian.com/pages/viewpage.action?pageId=281480970, however this does not work - the users do not have multiple child-id's.
They all belong to a JIRA Delegated Authentication Directory - but then so did all of the other users that I was able to remove from the groups.
Can you please help me to resolve this?