Hi @lKinosh.
Hope you’re well 
My apologies to know that you have still this error that doesn’t allow you play Lost Ark, and that you didn’t receive a reply in order to help you, I understand how frustrating this is, thank you for providing all the information so far and also the steps that you have tried.
May I ask if you tried the next troubleshooting:
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Try adding Windows firewall exceptions manually:
Press Windows + R, type “firewall.cpl” into the Run window, and then press Enter.
Click Allow an app or feature through Windows Firewall and then click Change settings.
Look for the game in the list of allowed apps and features. If it’s present, make sure it’s checked, and that both the Private and Public columns have a check mark. If the game is missing from the list, you must add it.
Click Allow another app…, locate and select LostArkLauncher.exe, and then click Add.
Once you’ve done that, make sure that Lost Ark has check marks under both the Private and Public columns.
If you did, please when you have a chance send a web ticket Contact Us | Amazon Games, with this information, extra information you have and also this forums post link, I know it sounds the same reply, but is the correct path, include the dxdiag in your web ticket when you have a chance.
DxDiag report:
Go to Windows Start search bar and type dxdiag.
Click on dxdiag.exe.
If you are unable to see the AppData directory you’ll need to enable “hidden items” under the view tab in File Explorer.
C:/users/username/AppData/Local/AGS
C:/users/username/AppData/Roaming/AG.
Since something in these folders can and does get corrupted which leads to a myriad of problems that should always be one of your first steps, not uninstalling and reinstalling the game.
Additional: You can also just rename the folders from AGS to AGS_TS and when you restart the game both folders will be rebuilt. Keep in mind that one of these folders has all of your game settings such as graphic choices and keybinds which will need set back up again if you delete them.
If this doesn’t work then you can just delete the new AGS folder and rename the updated folder back to AGS.
Just in case investigations can last long 3 days.
We here on forums cannot review any information about investigation or cases due security reasons, but I will be checking this post, so please let me know how was it.
Stay Safe!
