On AA, the status doesn't show up anywhere and it didn't help when a transfer agent tried to delete and re-enter my Latampass number into the reservation. I was advised to contact LA because according to AA, the problem is clearly on LA side.
Flew BA yesterday, and status didn't show up either. Both the agent at check-in and in the lounge tried to enter the number again but it didn't change anything. According to her the only option she had was LAN Comodoro but even with that status wasn't recognized. She let me in anyway which is very nice.
I also had a pretty rude answer from LATAM on which I've been told that if the status wasn't showing up on AA's system, they would have to call OneWorld desk to "prove" it ... Actually that's what BA did but still no change to the situation at this time.
With Finnair, no problem with status recognition; it shows up on the boarding pass, I got baggage priority and security and I was in group 2 for boarding.
It is good to know it works fine on Finnair ...