Originally Posted by
ISTFlyer
This is highly normal.
Jakarta is not one of the destinations that you could issue an online boarding pass or mobile boarding pass. You would need to visit a check-in counter.
Despite you have completed online check-in or not, your seat assignments would be secure. If they show up on your reservation when you view it online or on your phone.
Thank you very much for the super-fast response! Hopefully, the seats will stick, and I will have a better experience doing online check-in for the return flights!