[Arnavion]

Services support Yubikeys through U2F / WebAuthn, not anything Yubikey-specific, right? If you're using services that don't support that, I take it the apps you do use are using TOTP?

[nine_k]

This works with desktop / laptop where you can attach the key over USB.

On mobile, if it works at all, it should be NFC.

[ChancyChance]

All three of my banks do not support Yubikey according to their tech support.

[Arnavion]

I'm not asking you what they don't support. I'm asking you what they do support.

[ChancyChance]

Their own hard tokens and authenticator apps.