I bought a $500 gift card. I've done it several times now. This time, however, I did not receive my email rewards card. I went to the AARP help topics and checked the process. It said to wait 24 hours and to let them know if I had not received it.
I waited and called. I worked with a very nice service agent. She saw my purchase transaction and re-generated the email. I got it within a minute. Made my payment to Princess with no more issues.