Some people on FB seem to have currently problems with seat pre-assignment.
In my case (Y), I am OWE (shows on booking). The seat map offers me free preferred/extra legroom seats for free, and regular seats for a fee. That is weird
When I click to reserve a preferred seat that is shown as available on the seat map, it starts to get through then I get the message "Sorry, you are ineligible to select seat, please check your booking. [E23Z00116]".

Anyone aware of an IT glitch and how to go around it without hours on the phone.