@Laurapintas I am in the same position as you
Applied through FTE and invited to the Assessment days but now receiving the message "no slots available". I have emailed both FTE and BA just now but I sincerely hope this is just an error. Inviting more people than slots available is just ridiculous if that is in fact what has happened, giving people the excitement of the acceptance email only to shoot them down days later when they didn't book an assessment day within the first 24 hours. People will say "You should have booked it sooner" but when you have to sort out work, hotels, travel e.t.c this can take longer than a day. Fingers crossed anyway.