FIDO logins are not shared across relying parties (sites), each site gets its own (that's what makes FIDO phishing proof). If you want a single identity that mu

FIDO logins are not shared across relying parties (sites), each site gets its own (that's what makes FIDO phishing proof). If you want a single identity that multiple sites know about you'd, login using a third party identity provider where you'd use your passkey. FIDO2 resident keys do support multiple identities for a single relying party (site).