I'm still having the same problem on every single booking that is made by my corporate TA (it has never occurred on a direct BA booking). It's not something as simple as incorrect name spelling or format, as I can access a booking through BA.com or the BA app initially, then at a later date it gets locked out. I can call up and get the bookings unlocked, but that is starting to be a pain. As we know wait times can be quite variable at present, then depending on the knowledge of the person who answers it can take another 5-20 minutes to actually get my booking unlocked.
Are there still official BA IT lurkers on Flyertalk or have they all disappeared? I'm just trying to find the best way to get to someone who can actually diagnose what is causing this problem and obtain a fix (or a workaround). The BA call centre team just tell me that someone is entering incorrect details, but I am 100% convinced that this is a systems issue (either with BA or my TA). My TA is giving up on this now and telling me to sort it with BA (they are absolutely useless!).
More than likely what they are saying is correct possibly someone with similiar reference is mis typing. However sometimes it is booking reference specific, there have been occassioms of bookings made on particular date not working via MMB. If it is simply locked a call centre agent should be able to unlock it by just accessing mmb in a version of ba.com the call centre would know as BOD.