AuthLite Interactive Documentation
Quick Start: Install and protect Domain Admins AuthLite Features Supported Tokens Installation and Upgrading Configuration Token Management How to Log In Troubleshooting

You can assign as many YubiKeys and OATH tokens as you want to each user account, and they will all operate interchangeably. Each key will be programmed with its own distinct randomly-generated secret. So the loss or compromise of one key does not implicate any other keys the user still carries.

Each user account "takes up" only one AuthLite user license, no matter how many OTP tokens you assign to them.