To be clear, I have the BA PNR, and can open it in MMB. Only BA flights in there (and my AS FF). The problem happens after adding this booking/PNR to my BAEC account. I'm on the phone to BAEC USA and asked them to remove the booking from my BAEC account.
And the 'unable to login' happened only after I added this booking to the account.
Update: they confirmed removal and told me it might take a few hours to go through. Will check the BA app again later.
Last edited by frankvb; Feb 3, 2023 at 2:19 pm