These separate accounts are in separate shared vaults that we again both have access to (for emergency's, billing etc). Large banking corporations like PayPal, MasterCard, American Express, VISA and Bank of America. Conversely, we both have separate accounts to various medical websites (e.g.a Yubikey 5c Nano for our laptops and a Yubikey 5c NFC for our cell phones and other devices) that all provide TFA for this account? Conceptually, can we each have two or more USB keys (e.g. BofA supports USB Security Keys that support FIDO. Obviously, it would be quite difficult for hackers to get their hands on the tangible key. This USB key can be used for locking and unlocking the PC and is a part of two-factor authentication. For example, we have 1 Bank of America (BofA) account that we share with access to our checking savings and credit card accounts that is in a shared vault that we both have access to. The USB Security key or the physical security key is the advanced method of login authentication. Is there a practical way (when a website supports) two factor authentication (other than by SMS message) to have this setup for accounts in a shared vault.

Usb security key for bank of america