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"Can I use passkeys across multiple devices?
Yes, passkeys allow you to use
cross device authentication: a passkey might be stored on one device, and you can use it for sign in on another device.
This is handy, for example, when you need to sign in on a new device.
To link your devices together for cross device authentication, you must scan a QR code that's generated on the device where you want to sign in. During this process, a
proximity check takes place to ensure that the passkey is only being used for authentication on a link device that's nearby. With this technology, you can rest assured that your passkey can't be used by a remote attacker to gain access from far away."
Passkeys frequently asked questions (FAQs) and product feedback
support.microsoft.com