Error code

Steam 88

STEAM88
Game/Platform Error· An error code shown by a game or gaming platform/launcher.

What it means

The Steam Mobile Authenticator code entered was incorrect — EResult 88 (TwoFactorCodeMismatch)..

How to fix it

  1. Re-enter the current code from the Steam mobile app.
  2. sync your device's clock to internet time.
  3. wait for the next code rotation and try again.
  4. use a backup recovery code if the error persists.

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