Error code

Steam 85

STEAM85
Game/Platform Error· An error code shown by a game or gaming platform/launcher.

What it means

Mobile authenticator code required to log in — displays "You need to provide a TOTP auth code" (EResult 85)..

How to fix it

  1. Open the Steam mobile app and retrieve the current 2FA code.
  2. ensure the device's clock is synchronized.
  3. use a recovery code if the mobile device is unavailable.
  4. contact Steam Support to remove the authenticator if access is permanently lost.

Not affiliated with Steam. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.