I think i have only got that message when the game still thinks i am logged in after a crash and i need to close the game completely, including steam. Making sure it is not still running via ctrl+alt+del
And closing the program from there too if it is still running.
I saw this in another thread about that error code.
Another had suggested to try and use a VPN to connect with.
This seemed to have success in logging back in.
Also this - I know it says conan, but the problem could be similar.
Just look for “Secret World Legends” folder in SteamApps and see if you can run either the .exe or the DX10.exe versions from there.
These suggestions were from conan back in 2020 - they may or may not be helpful here but i guess you could try.
https://forums.funcom.com/search?q=failed%20to%20authenticate%20with%20character
Maybe also look through the search list of the same error, something might help.
Hope to see you back in game soon, was wondering where you had got to!
Daciano.