If you have 1Password it supports OTP and thus can be used across devices.
YubiKeys can store and access OTP secrets. I put the secret in both Google Authenticator and my YubiKeys as backup.
They refused a refund as well.
Horrifically bad company customer service, UX, UI. Save yourself the trouble and skip them, call 1Password.
On the one hand a password could be popped from the target site or phishing, and you’d still need the 2nd factor from 1password to get in.
But on the other hand, if you leave your phone lying around unlocked with a poor master password, both get popped together.