Hi @nickp - welcome to the KM forum.
You should read this TIP: Resolving Big Sur Accessibility, Security, and Other Issues as it specifically mentions XKey devices and Big Sur. It's not good news I'm afraid. 
Hi @nickp - welcome to the KM forum.
You should read this TIP: Resolving Big Sur Accessibility, Security, and Other Issues as it specifically mentions XKey devices and Big Sur. It's not good news I'm afraid.