Actually, you're right - that capability has apparently been available since last year: https://www.yubico.com/2018/05/yubikey-comes-to-iphone-with-mobile-sdk-f

Actually, you're right - that capability has apparently been available since last year: https://www.yubico.com/2018/05/yubikey-comes-to-iphone-with-mobile-sdk-for-ios-and-lastpass-support/ https://www.yubico.com/2018/05/yubikey-comes-to-iphone-with-.... The link I cited is for lightning-connected Yubikey hardware, which is supposed to come out this year.