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2FA with backup Yubikey

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So this is a WHMCS shortcoming/choice disallowing more than one key?



For any services that use Yubico OTP or FIDO security protocols, you'll just need to register the second key exactly as you registered the first. So you can follow the same setup instructions listed in our Works with YubiKey Catalog. 
It's important to note that keys are not linked together in any way. Instead, both keys need to be registered separately to the account, and then either can be used to authenticate with. 

I stopped using my Yubi with WHMCS (time based via phone app now) when it no longer worked after an upgrade to WHMCS, so don't recall if it showed a QR code or not. If it does, just save the QR code along with the backup code(s), and use that on key #2, according to Yubi. Seeing WHMCS uses OTP, however, has me thinking it's no QR code.

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