Backup codes are one-time recovery codes generated automatically when you enable TOTP. Each code can be used once in place of your authenticator app code if you no longer have access to it.
How to use: at login, after entering your password, click
Use backup code and enter one of your saved codes.
Regenerating: go to
Settings → Security → Backup codes and click
Regenerate. All previous codes are immediately invalidated.
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Store your backup codes outside the platform — in an offline document or a password manager. Do not store them in your browser or email.