I really don't see how you can blame Yubikey for this one, your employer is entirely to blame for only supplying you with one Yubikey.
Your hardware fault is unfortunate, I've been using Yubikeys for many years without a single issue. But ultimately that is beyond the point here .... come on dude, you work in IT, surely by now you know you don't put all your eggs in one IT basket ?
Not following fundamental best-practice and then complaining when things break is really a "move along, nothing to see here" moment.