Originally Posted by
tanglin
Solved! - Many thanks all who pointed out the SM number was key, and for directing me to doing it in the App.
Although Amex have my number on file, they don't seem to be attaching it to the reservations. I managed to do this using the Delta App, and now both upcoming trips are shown.
Always have to double check the data AMEX puts in. I had a flight booked with AMEX PLT where they put my TSA # in for my wife's reservation too. Luckily a DL phone agent happened to see that