Originally Posted by
fruitcage
If there is no ticket number then you almost certainly don’t have a ticket yet.
I don't think that's the case here. OP mentions it's an AA/BA itinerary. My guess is that it is ticketed, but OP is using the non-prime PNR in BA MMB, but there will be another BA PNR which should show the ticket number.
Agree that best to check with the TA - if they are anything like my corporate one they should have sent the ticket number in an email confirmation once it was ticketed.