First please confirm that osTicket can only be setup to create tickets sent to the default email i.e. one cannot setup a second email as one that also creates tickets.
So I logged in as an agent, selected Admin panel, then Emails tab, then Emails screen, then selected the default email.
In section "Fetching Email via IMAP or POP", I setup my IMAP settings and for Fetched Emails I chose to move to a folder which I set to Inbox.Archive. Updating the page I realised that the folder must not already exist as the creation itself is done with the update. However this is problematic since any update on that screen a second time cannot be successful since the second time the folder is already created!
Is this a bug or am I doing something wrong?