Got EAC Offline error and got disconnected in the middle of an Argos run. Tried to reconnect to the game 3 times but got disconnected about 5 minutes later. The 3rd time I reconnected, the run has been finished but I was unable to get my rewards. Now i got no rewards and can’t entry another Argos run.
Very nice! 
Welcome to the Lost Ark forum community and sorry to hear you’ve encountered this issue as well, Lamze.
The development team is currently aware of this issue.
Not wanting to make countless forums of this already but recently I too have been getting countless EAC error. Not just EAC but other random errors that would DC me.
I never used to have theses error but whatever happened recently, has cause Lost Ark to be unplayable.
Every time I login, it can be range anywhere from 2 mins or 5 mins and it is constantly happening. I can’t do Guardians, i lose items in Chaos dungeon, I can’t risk playing in vykas of fear getting DC.
I can’t even do a simple Island daily task.
Whatever this error is, it has caused me to feel burnt out and I hate to end it on a bitter note.
At this point, I just can’t play Lost Ark anymore.