alt Hacker NewsI used the technical name for the capability, but you've likely run into it before.
If there is no passkey on the local device, a QR code will appear which you can scan with your phone or tablet, and use the passkey for the account from that device. It just kind of happens, typically without the user having to do anything special.
I will say though, corporate devices can be a bit of a wildcard as they are usually configured and locked down for a specific purpose. But the cross-device flow is generally not blocked by organizations.
I don't use passkeys, so I haven't run into it. It seems like that screen would be gated behind entering an e-mail address or username that is already registered with a passkey on another device.
What I'm saying is, I thought I had the right mental model of how passkeys work, after researching them, and that mental model told me you wouldn't be able to log in on a different device without going through a whole procedure to set up a new passkey, which you wouldn't want to do for something temporary.
The mental complexity is just too much for me to trust that if I adopt them, they'll work when I need them. The fact that I got this thing wrong means there's probably other things I'm still getting wrong.
I understand passwords and password managers and even 2FA. I feel like I can plan how to use them right so it all works and I don't need to worry about not being able to access my accounts. I just don't have that confidence with passkeys.