Has anyone had issues redeeming this flight credit? I just tried using the discount code for an upcoming flight (expires in 2024), the system accepted the code and let me process the remaining payment but I got an email 5 minutes later saying my payment failed and need to call to book. AA customer service not able to manually reprocess the discount code & got an error each time. Anyone run into this issue? I feel like this has always happened in the past with these vouchers.