Moderator, Iberia Airlines, Airport Lounges, and Ambassador, British Airways Executive Club
Join Date: Feb 2010
Programs: BA Lifetime Gold; Flying Blue Life Platinum; LH Sen.; Hilton Diamond; Kemal Kebabs Prized Customer
Posts: 64,176
If it's not an obvious question, have you looked at Update My Personal Information in BAEC? The standard (so non USA) Advance Passenger Information is held there, and that is validated on flights to the UK from outside the Common Travel Area. That's visible on the full BA website.
If that is OK, I agree it is probably some other glitch which is reporting in this way, and the error itself may be a red herring. If you have a valid ticket number in Manage My Flights and a valid passport then I wouldn't worry, but I wouldn't get to the airport too late (90 minutes is fine at BIO, it's a small and efficient).