A couple weeks ago I flew from Rome to London to Los Angeles on BA, on a ticket purchased through American Express Travel, which appears to have been on an American Airlines ticket number, with AA flight numbers, but both segments were operated by BA.

Boarding passes were printed by BA in Rome, show the BA flight numbers (indicating "Sold As AA flight #'s"), and reflect my BAEC number.

For missing Avios on the BA website, it requires a BA ticket number. And for partner flights, you must indicate the operating carrier. If I select BA, it flips me back to the BA missing Avios page.

Has anyone encountered this?

Thanks in advance for any guidance.