so weird. I just called LATAM and told them Delta mentioned the error Delta had with "you don't have an electronic ticket". I gave LATAM the ticket number Delta had and they said the ticket is fine, and told me which seat's I'm in (even though the LATAM website shows me unassigned) and told me to go check-in at the counter. I'll get there super early (4 hours), and I am flying business class, so hopefully that skips lines or adds escalation/urgency

sigh...