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How to use a security key for multi-factor authentication Enter one of your emergency backup codes.
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Use the steps in your app to add a new account using a secret key. Manually enter your secret key: You'll be given a secret key on that you can type into the app.You may then be able to use your phone's camera to scan the barcode on. Scan the barcode (If your app supports it): Open your app of choice and choose to add a new account.Select Use a mobile app during multi-factor authentication setup.If you use an authenticator app to receive your verification codes, please add primary and secondary backup phone numbers. Any app that supports the Time-based One-Time Password (TOTP) protocol should work, including: Most authenticator apps can generate security codes even when cellular/data service isn't available, which can be useful when traveling or where coverage is unreliable. The authenticator app you choose will need to generate a unique time-sensitive security code. If you choose to receive your security codes through an authenticator app, you’ll first need to download one.