STEAM - Connection Failed Error 1:86001S:66003S:468882297O:0B

This error is caused by your account having two separate EA IDs which is not something that should be possible but I can promise you that if you were able to put into a ticket, you're wasting your time. EA support literally does not grasp what the issue is and I tried to argue with them for over 5 hours last night. Basically for example if I go on the EA desktop app and go to my profile, it will not show my correct EA ID instead of my current one but by changing my "Nickname" on that profile to the correct ID it would overwrite the nickname and fix my profile to have the correct name. This issue would happen to me with Battlefield 2042 and that was how I would fix it.

However, now I'm in the same situation as you as I own the game on steam and this is not an option to fix the game. No matter how many tickets you put in support doesn't understand what the issue is and our games are basically bricked unless you can convince them to fix this issue on your account. The error we're getting is an account authentication error caused by ID mismatch and you literally cannot fix it on your end with the Steam copy of the game without starting over.

I've tried unlinking and relinking to the same account but it did not fix the issue. Linking to a brand new account should 100% fix the problem but you're going to probably lose all of your game progress that you made on the first day.