As previously requested 3 years ago which the same scenario applies directly to my situation.
"Can you please add the ability to store more than one Yubikey with each user account like LastPass does? You can store up to 5 keys with LastPass which is very useful. For example, I have three. One for work PC that is never removed, one for home PC also never removed and one on my keychain so that if I'm at a customer site (or anywhere besides home or work for that matter) I can use that one.
Customer support service by UserEcho