Passkeys are somehow 100% seamless for me, except for two services that have somehow screwed up the implementation: Google, and Okta. In Google's case, they have made it so that if you _ever_ add a passkey to their password manager, it somehow refuses to work with a third-party password manager going forward. In Okta's case, the admin policy UI makes it next to impossible to have passkey-only login without their Fastpass app or an oldschool password login.