How does that work if you can register multiple different keys using different devices from different vendors on an account?
Edit: I took the last sentence out, it was childish on my part.
Edit: I took the last sentence out, it was childish on my part.
Yes, some individual implementers recognize the issue and have "log in with another device" (which is the best option you can have, although still quite clunky), so you can solve the chicken-and-egg problem of logging in on another platform's device to add your another platform's passkeys. But to best of my awareness, this is not a part of any standard or recommendation (it should've been).
And other implementers do the contrary and artificially limit your options so you can't add a portable authenticator with them without some hacking around.
Also (i think) none of them are open source?