If you try and set up a passkey in Windows there is the possibility that if it goes wrong you will end up with an entry for a device but no passkey. I got this for a OnePlus device as the OnePlus Android OS (at the time of writing) does not support allowing Microsoft Authenticator to hold passkeys.
You will see something like this in Windows when trying to login with a passkey:
My OnePlus, called “Flowy Emerald” (the colour of the device) as its Bluetooth name, is listed as the default option and one of my choices for a passkey – but it does not work, so I would like to remove it.
This is done by deleting the below registry key:
HKEY_USERS\S-1-5-20\Software\Microsoft\Cryptography\FIDO\(Account SID)\LinkedDevices\BadDeviceName
You can also rename devices from here, for example if you have added a device and again the same device by mistake, you might get “My Phone” and “My Phone (1)”.
Then the next time you go to login with a passkey, you won’t see the device being offered by Windows or will see it renamed:
Photo by Philip Warp: https://www.pexels.com/photo/man-riding-embankment-road-under-bridge-on-orange-bike-11608658/
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