Short Answer: In the "Set up two-factor authentication" modal copy the Key (shown under "Or, Enter code manually :"), enter it in your authentication app manually, then enter your Current password and the app’s 6-digit code, and click "Verify".
Answer
PreRequisites
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Be signed in to your account.
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Have an authentication app that supports manual key entry.
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Know your account password.
Steps
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Open My Account > Security and click "Enable 2FA".
The "Set up two-factor authentication" modal opens. -
Under "Or, Enter code manually :", copy the full Key value exactly as shown.
The Key is copied or noted for manual entry. -
In your authentication app, choose the option to add an account manually and paste or type the Key.
The app creates a new account entry and starts generating 6-digit codes. -
Enter your Current password and the 6-digit code from your authentication app into the modal’s "6 digit-code" field.
The fields are filled with valid values. -
Click "Verify" to complete the setup.
Two-factor authentication is enabled for your account.
Troubleshooting
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The authentication app rejects the manual Key or shows an error.
LikelyCause: The Key was copied incorrectly or contains extra spaces/characters.
Action: Copy the Key exactly as displayed, remove leading or trailing spaces, or type the Key manually if necessary.
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The 6-digit code is invalid during verification.
LikelyCause: The Key was incorrect or the device clock is out of sync.
Action: Re-check the Key, re-add the account in the authenticator app, and ensure your device time is automatically synced before generating a new code.
Note: The Key field is provided specifically for manual setup when QR scanning is not possible. Make sure to copy the entire string exactly.