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If you have a QR code, make sure the QR code is visible on the screen and select the Scan QR Code button. You will be presented with a form to fill in the information into the application. Select the Yubikey picture on the top right. You then see a ‘Success!’ confirmation box appear. Open Yubico Authenticator for Desktop and plug in your YubiKey.
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Creating and viewing a set of backup codes Like the codes on your phone, backup codes are only valuable to someone if they manage to also steal your password. We recommend you store your codes wherever you keep your other valuable items. Wenn Sie die Authenticator-App zum ersten Mal einrichten, erhalten Sie möglicherweise eine Eingabeaufforderung, in der Sie gefragt werden, ob Sie der App den Zugriff auf Ihre Kamera (iOS) gestatten oder der App das Aufnehmen von Bildern und Aufzeichnen von Videos (Android) gestatten soll. In addition, after you’ve used a backup code to sign in, it will become inactive. The codes come in sets of 10, and you can generate a new set at any point, automatically making the old set inactive.
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You can also use these codes to sign in if you don’t have your Security Key. Follow the instructions below to generate backup codes. If you lose your phones or otherwise can't receive codes via SMS, voice call, or Google Authenticator, you can use backup codes to sign in.