Originally Posted by
EvilDoctorK
One is new , one isn't ... but yes good theory

.. but I think it's a more general issue
Both are BA Holidays bookings .. tickets have been issued with 125-xxx numbers ... The page on BA.com before you get sent to IB.com gives the usual BA 6 character alpha numeric locator and also gives an IB 5 character alphabetic only PNR which then doesn't seem to work on IB.com ( nor does the original BA PNR or the BA eticket number )
Sounds like you may need to call BAEC to check the IB PNR is correct and then call IB if you still cannot get in.