I just got off the phone with MR CSR. I explained that I got my card in mid-March and heard there might be a 100K bonus promotion out there during my sign up time.

He asked if it was bonus ID 3882 and he chuckled saying they've been getting tons of calls about it. He was super super nice and spent 20 minutes looking through his system for a different code. He said 3882 expired mid-Feb, but there are a lot of codes for the same promotion and found 5748 worked for me.

He couldn't post it right away because I paid my bill after the cut-off, but he would note it on my account so that after 6-8 weeks I could call back and get it.

Amex hands down has the best CS out of all the card companies. Thats why theyre the only ones Ive stayed with since I turned 18