Mine did this too! First time I have received one to my email since 2012 and it didn't recognize it! However, do you travel with anyone else ever? After putting in different combinations, I found it has my email address, but my parents (my maiden) last name and their zip code. We've booked trips together but theirs has always been on my mom's email expect for when they were listed under my dining reservations. I've had this email a long time but only since I've been married (the email even has my married name in it) and I've never booked trips under my maiden name, and I've never lived at my parents' new home. It's strange for sure!