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Most FIDO2 keys cost between $20 and $50. Popular brands include Yubico (maker of the Yubikey), Token2, and Thetis.
Keys vary by material, ruggedness, water-resistance, and interface. The most important consideration is the interface:
Buy a security key that has a USB-A interface if you plan to use it with a desktop computer at home (Mac or PC)
Buy a security key with a USB-C interface if you have a Macbook or PC laptop that has only a USB-C port.
Optional features include NFC for wireless sign-ins on an Android device, but if you have a device capable of running Android or iOS we recommend just using the Authenticator app.
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Go to https://mysignins.microsoft.com/security-info to add a new sign-in verification method.
Click the Add Method button.
Choose Security Key and click the Add button.
Follow the on-screen instructions to finish setting up your security key. You will be prompted to choose the type of device you have. Select USB Device
Insert the USB security key into one of your computer’s available USB ports when prompted, and follow the instructions. You may need to wait a few seconds for the prompts to appear. Windows should automatically recognize the device, but depending on the brand of security key you may need to refer to instructions from the manufacturer. Some security keys will prompt you to create a key, and others will prompt you to touch a button that will read your fingerprints.
Using your Security Key to sign in to Office 365
Plug your USB security key into the computer.
When you sign into Office 365 you will be prompted to enter the PIN you created while setting up your security key.
Touch the security key when prompted
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