Cross posted in AA forum

The situation has been resolved. I was reconfirmed in F on Friday's seat (but not in my original seat). I discussed the situation with the AA RTW desk, who said that they ticket number had been sent to them when segment was confirmed in April. Last Friday, they sent a message over saying please send ticket number (despite the message not previously being in the confirmed reservation). Within 3 hours of that message arriving, they cancelled the segment and waitlisted me. AA confirms (having looked back through the PNR history) that the ticket number had been sent over. They then liaised with the CX revenue management who reconfirmed me on the flight. As an aside, they did not have my AAdvantage number in the reservation despite AA having input it in. Any ideas about what really happened?