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Novaz AuthenticatorGET

GREE 2FA: how to set up an authenticator app

By the Novaz team · Updated October 29, 2026
Novaz steps checked against version 1.0.5

On this page
  1. Before you start
  2. Turn on 2FA with an authenticator app
  3. Signing in afterwards
  4. No backup codes
  5. If GREE rejects your code
  6. If you lose your authenticator
  7. Changing phones
  8. Turning 2FA off
  9. Official GREE help

GREE (グリー) is a Japanese game platform. You sign in to your GREE account with your registered email address and password. Two-step verification (2段階認証) adds a code from an authenticator app to that sign-in. It's optional: GREE says it isn't required and you can turn it on or off as you like (GREE).

Two things set GREE apart. Its help says you turn the setting on in the browser version of GREE (ブラウザ版GREE) on a smartphone, which means the QR code usually appears on the same phone that will hold your codes. And the only method its help describes is an authenticator app: it doesn't mention text-message or email codes for the second step (GREE). GREE's pages name Google Authenticator. This guide uses Authenticator App - Novaz on iPhone, but any authenticator app works the same way. GREE's help center is only in Japanese, so the labels below are copied from it, with our translation in parentheses.

How we checked this guide: the GREE steps come from GREE's own help center, in Japanese, linked below, which we read on October 21, 2026. We haven't tested them on a GREE account, so a label may differ slightly. The Novaz steps are checked against the app, version 1.0.5.

Before you start

  • You need a full GREE account. Two-step verification is only for users who have finished profile registration with an email address and a password (GREE). If you play on a guest registration, add an email address and password first.
  • You need a smartphone. GREE says the feature is for customers who have one (GREE).
  • Check your email account. Your registered email address is also GREE's way back in if you lose your codes (see below), so make sure you can still get into it.

Turn on 2FA with an authenticator app

On your iPhone, open the browser version of GREE and sign in. Then follow GREE's steps (GREE):

  1. On the GREE top screen, choose メニュー (menu) at the top right.
  2. Choose 設定 (settings), then セキュリティ (security).
  3. On the security screen, choose 2段階認証 (two-step verification).
  4. Choose 有効にする (turn on).
  5. Enter your パスワード (password) and choose 続ける (continue).
  6. GREE shows a QR code and a キー (key). Because the QR code is on the iPhone you're holding, take a screenshot of it. In Novaz, tap +, then Choose a photo, and pick the screenshot. See scanning a QR code on the same iPhone. If you're viewing GREE on another screen, tap + and Scan QR code instead.
  7. Or type the key: tap +, then Enter key manually, and fill in Service, Account (optional) and Setup key. GREE's help doesn't say how long the key is or how often codes change. Novaz needs a key of at least 16 characters and makes 30-second codes from a typed key, so if the codes don't work, use the QR code. See What is a 2FA setup key?
  8. Back in GREE, type the 6-digit code from Novaz and choose 続ける.
  9. GREE confirms with 2段階認証が有効になりました (two-step verification is now on).

Delete the screenshot afterwards: anyone with that image can make your codes.

Signing in afterwards

GREE describes the result simply: after your registered email address and password, the sign-in also asks for a 確認コード (verification code), so a stolen password alone won't get someone in (GREE). The help doesn't say whether you can mark a device as trusted, or whether かんたんログイン (easy login), which carries your sign-in from the GREE app to the browser version without a password, asks for a code (GREE).

No backup codes

None of GREE's two-step verification pages mention backup or recovery codes. Its fallback is a link sent to you, described below. If you have no Novaz backup, its keys are only on your iPhone, so plan on that link, and on keeping your registered email address current.

If GREE rejects your code

GREE's help doesn't cover rejected codes. Check your iPhone's clock: Settings > General > Date & Time > Set Automatically. Novaz warns you when the clock is 15 seconds or more off. More fixes are in Authenticator code not working?

If you lose your authenticator

If you can't get a code, for example because the phone is lost or you're on a phone without your authenticator app, GREE can send you a sign-in link that skips the code, by email or text message (GREE):

  1. On the sign-in screen, enter your registered email address and password and tap ログイン (sign in).
  2. Under またはメール/SMSを送信してログインを続ける (or continue signing in by sending an email or SMS), tap 送信 (send).
  3. GREE sends a recovery URL to your registered address. Open it.
  4. Enter your email address and password again and tap ログイン.

Once you're in, GREE says to turn two-step verification off. To turn it back on, you'll need a new code from your authenticator app, so set it up again with the steps above. The help doesn't mention any other proof of identity, which is why your email account's security matters here. If you've also lost your password, start from GREE's sign-in help. More in Lost the phone with your authenticator app?

Changing phones

On a new phone, GREE says to sign in with your registered email address and password, and to check that address before you switch. It doesn't mention two-step verification (GREE). With Novaz's iCloud backup or a backup file, you can restore your accounts on the new iPhone. Without one, while you still have the old phone, turn the setting off, then on again and add GREE to Novaz on the new phone. If the old phone is already gone, use the recovery link above. See How to transfer your authenticator app to a new iPhone.

Turning 2FA off

Sign in to the browser version of GREE on your smartphone, then go to メニュー > 設定 > セキュリティ > 2段階認証 > 無効にする (turn off) (GREE). Then open GREE in Novaz and tap Remove account.

Official GREE help

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