How does SteamKO phone authentication work?

  1. Start the game; the phone authentication screen appears before server selection. Click Confirm.
  2. Pick the language in the top right (English, Türkçe, Español).
  3. Choose your country code and type the number without spaces, digits only; no leading 0.
  4. Click "Check Phone Number" and enter the SMS code within 10 minutes.
  5. If the code isn't accepted, use Retry. If you run out of the 3 tries in 10 minutes, wait 10 minutes.

According to NTTGame's official guides, the system started with phone calls in 2018 and switched to SMS in January 2020. One phone number can verify up to 3 accounts, and accounts created before February 28, 2018 are exempt.

Phone authentication error messages

SteamKO phone authentication messages
MessageMeaningWhat to do
Too many verification attempts. Please try again in a few minutes. [-6-3-1] The 3 tries per 10 minutes are used up Wait 10 minutes and try again
Your computer was blocked. please contact the support. [-16-9] The PC was blocked after repeated failed attempts Open a support ticket
An unexpected error has occurred. Please try again. [-14-10] The SMS couldn't be sent; players mostly report it with foreign numbers Check the country code and retry; ticket if it persists
Code entered but it goes back to the phone screen The verification didn't complete Restart the game; ticket if it persists

My country code isn't listed or the SMS never comes

Players report missing SMS or missing country codes with foreign numbers (Australia, Germany, Peru and others). You can't get past this on your own: open a ticket on the support site with your number, country and Steam profile link. Don't use someone else's number; there's a 3-accounts-per-number limit and your account security gets tied to that number.

Is it the same as OTP on the Turkish servers?

No. NTTGame's Turkish servers (nttgame.com) protect logins with ICS and OTP; the Steam version has no OTP and does phone authentication on an in-game screen. For the Turkish servers see How to set up and activate OTP in Knight Online: ICS, AnyOTP, changing your phone and trade SMS.

FAQ

The SteamKO phone code never arrives. What do I do?
Check that the country code is right and the number has no leading 0 or spaces, wait 10 minutes and try again. With a foreign number, open a ticket.
How do I get rid of "Your computer was blocked -16-9"?
You can't lift it yourself; support removes it through a ticket. Players say it was cleared after they wrote in.
How many Steam Knight Online accounts can one number verify?
Up to 3. A fourth account needs a different number.
Does my old account need phone authentication too?
Accounts created before February 28, 2018 are exempt. It's mandatory for accounts created after that date.

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