error: Authentication failed -- application will now terminate

[Blackie]

Disable advance steam detect or completly disable killer N software if your motherboard has one and you are using it. It prevents The game to connect to the server for some reason.

[DiMakss]

If none of these worked try deleted patchui_win.dll in your folder while launcher is closed and restart the launcher and game. Worked for me so possible solution

It helped exactly 1 time, now even after file removal the same error.

[Rumeu]

Had the same issue, but changing the language in the launcher to Spanish and vice versa fixed it for me.

[Grawh]

I am also having this same problem. The only thing I found that worked was repeated attempts. I quit counting after 30 attempt but I finally got on.

[DaWaffleSupreme]

If none of these worked try deleted patchui_win.dll in your folder while launcher is closed and restart the launcher and game. Worked for me so possible solution

I did this, it did nothing for me.

[Deltadog10]

i tried everything people suggested and still not working the only i havent done is the malware but idk how to do that

[ZHEDOVSKI]

If none of these worked try deleted patchui_win.dll in your folder while launcher is closed and restart the launcher and game. Worked for me so possible solution

Thank you!! We had this problem with my brother and deleted file "patchui_win.dll" can fixed