On my (first segment already flown) DONEx, I'm trying to change the date on a domestic AA flight (marketed and metal) to one which both expert flyer (D1, USA POS) and ITA matrix show D availability. I've called the AA RTW desk and both times they saw no availability.

I then went to aa.com to check a cash booking. The "details" pop-up on the "Your trip summary" says the booking I started would be in D.

Is this a known / common issue? Any advice beyond letting time pass and/or calling a 3rd/4th/... time?

Many thanks!