Yubico has proffered a standard enhancement designed to enable FIDO keys to “automatically” enroll a paired backup when you enroll a primary key. They wrote ab

Yubico has proffered a standard enhancement designed to enable FIDO keys to “automatically” enroll a paired backup when you enroll a primary key. They wrote about it here in 2020: https://www.yubico.com/blog/yubico-proposes-webauthn-protocol-extension-to-simplify-backup-security-keys/ https://www.yubico.com/blog/yubico-proposes-webauthn-protoco... I’m not clear on whether it has gained any traction, and it’s not something I see a lot of my peers in security aware of.