Originally Posted by SFCav

Thanks for the heads up! They did confirm me in a seat and when I went into my delta account I was already checked in.

The REAL kicker here is that there are 24 C+ seats open on this flight, per the upgrade list on the app. I know that's not always an accurate indication of actual seats available (maybe someone with EF can confirm, DL 1283 on June 19), but seems suspect in any case.