I've got a similar question.

I booked a reward ticket online a few weeks ago. I phoned the AE number to get seats assigned for my wife and I, but they were closed at the time. So, I phoned the SE desk and got us booked into emergency row seats. Of course, I asked to be emailed a confirmation (which I received).

When I look up my booking on AC.com, I see that there is no seat assignment shown. Does this mean that my seat assignments are gone? Should I call back in? I notice that all of the exit row seats are now taken so I'd have to select somewhere else to sit.