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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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Adding your security key as an MFA sign-in verification method
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.
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