Authentication error(help)

[deep_speed2001]

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GTA V version?
Last version
Up to date?
yes
Legit or Pirate copy?
Legit
Steam/CD/Social Club?Steam
Windows version?10
Did you try to delete caches.xml and try again?
Yes
Error screenshot (if any)
yes

System specifications
i5 6300 gtx 960
What did you do to get this issue?
Nothing
What server did you get this issue on?
after log in it gives me a error(Authentication error)

[hallux]

Run Steam in the background, you do not need to utilize Social Club validation if I recall correctly, when you own Steam version of GTA.

If that does not work, run GTA 5 via Steam, let it load up and such, then exit GTA 5 and load up FiveM.

[Hellderis]

try to remove 2step authentication

[Painwithin]

social club is always used to validate the game license. whether it be steam or not.