Yubikey
Add two-factor-auth for YubiKey.

Thank you for your input. We will explore the possibility of implementing YubiKey in upcoming releases.
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Ragnar Karlsson commented
I would like to see Yubikey and U2F implemented, that way the option remains for those who choose not to use U2F but still want two factor authentication.
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Paul commented
While the U2F is an excellent standard, it has yet to be adopted by the majority of browsers. Yubikey would be a great implementation, particularly before U2F is widely adopted.
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peter commented
Yubikey is a token provider.
I would prefer that plesk supports the u2f standard, which aims to be universal.
If you develop the extension for the u2f standard then other token providers will work too as long as they conform to the standard.