I am a premium LastPass subscriber.My wife & I have four older Yubikeys allowing us to access Lastpass (using different sub-identities of one shared account).Two were standard Yubikeys bought 2011 (Firmware 2.2.2) and two further Yubikey Neos (firmware 3.1.2) were bought in 2013 as these offer the NFC needed with mobile phones.
I have just bought a YubiKey 5C NFC, as the NFC on one of the older pair has stopped working.Under Advanced Settings\Multifactor Options, I’m looking at adding this new YubiKey 5C to LastPass (as it allows 5 devices) but I'm finding the options confusing.My 4 old Yubikeys are already registered as OTP Yubikeys, under the ‘Multifactor Authentication – Free’ account options.
To add my new YubiKey 5C, I am directed to the ‘Multifactor Authentication – Premium’ option.But if I follow this for my new Yubikey, will the 4 older ones still work, or become not recognised for access?