Agent cannot see closed tickets they personally worked on when 'Limit Access exclusively to assigned Tickets' is enabled
When a ticket is closed, osTicket removes all agent and team assignments. Since the agent is restricted to assigned-only access, they lose visibility once the ticket closes. Solution: use Department-based access instead of assigned-only. Add the agent to the relevant Department(s) so they can see tickets by department membership rather than assignment.
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What the setting does (explanation)
The 'Limit Access exclusively to assigned Tickets' option restricts an agent to only seeing tickets directly assigned to them or one of their teams. Without this option, agents see all tickets in their Department(s). When enabled, an agent loses access to a ticket as soon as it closes — because closing removes the assignment — even if they personally resolved it.
Originally sourced from forum.osticket.com . osFAQ.org summarises community knowledge for quick reference.