So I have two seat coupons that I won in the AAdvantage 40th Anniversary contest last year. They expire in June. I went to apply them to an existing reservation. I select the MCE seats, and say that I want to pay with cash. It tells me that I have eligible seat coupons that I can apply. I click "choose coupons" and select the two coupons I want to apply. Then on the next screen I get this lovely message:

Based on your selection, we applied 0 of 2 coupons.

Am I doing something wrong here, is it broken, or is it erroneously telling me they're eligible when they're really not eligible?

I also notice that it says "preferred seat coupon" and not MCE seat. Does that mean they're NOT applicable to MCE seats?