I hear this a lot but it hasn't generally been my experience. The only site I've personally come across that supports webauthn/passkeys but doesn't support multiple is the AWS management page. Which I essentially bypass by just configuring SSO and using an IdP which does support it.
Every other site I've come across that supports these things supports multiple. What common sites support only one or two?
AWS now supports multiple MFA devices per account.
That's awesome to hear, thanks for sharing!
This effectively makes it impossible to do what you’re saying for these websites. And it’s sort of an all-or-nothing thing: even if just one service is like this, then I either can’t use passkeys for it, or I have to find a way to sync across device. It sucks.