Computer Glitch not fixed
Booked an award with BOS-LHR and LHR-LAX operated by AA. Unable to change to preferred (green) or preferred plus (purple) seats online. Called and agent initially said it wasn't possible because of my miles ticket booking class. I explained that as an MVPG that I should have access to these seats, the agent decided to follow up with their help desk. I was transferred to help desk and after about 30 mins the help desk was able to get me in exit row seats. They claimed it was a computer problem.