Amazon.com.au:Customer reviews: Yubico - YubiKey 5C NFC - Two Factor Authentication USB and NFC Security Key, Fits USB-C Ports and Works with Supported NFC Mobile Devices - Protect Your Online Accounts with More Than a Password
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great ...but when they 'recommend' two keys (one for back-up) what they really mean is you kind of 'NEED' two (one as back-up) ... some platforms simply won't let you proceed unless two are registered.
simply @#$ opinionated services, no fault of yubico - although they definitely benefit.
I had a look at the supported services before buying this key and my bad for just looking at the logos and not digging into all the instructions as that page is very misleading. Not all services advertised as working with yubikey actually work as expected. My expectations were to have to plug the key in, touch the gold bit and use that as 2FA however a lot of the "supported" services rely on the yubikey authenticator app instead. This means that you still need to type in the 6 digit code which is the same as if you were using the google authenticator/ last pass authenticator app etc. The only difference is that you'd need to authenticate to the app with your yubikey and then you'd see the 6 digit code. This method isn't all that secure, as if you click on a phishing url and not realise it, you can still easily allow an attacker to gain access to your account.
Now props given where props are due, google supports the key properly which means when you type in the password, you need to plug the key in, touch the gold bit and it automagically does the authentication. This is how I'd expect all services listed on the site to work and hence the 3 stars.
Although this works almost as expected my issue comes from the I believe 32 2fa account limit when using the 6 digit code it can store. When contacting support they told me this is because its not normal storage and they cannot go above that, not that fine except not all sites support fido2, and alot of sites don't support standard 2fa codes yet so gonna be a while. And this product is very poor for anyone with high usage and needing the security.