• First check if the Key works on another USB port.
  • If not, try another Key on the PC to see if the port is malfunctioning.
  • If still not working, try the Key on another PC.
  • Check for any physical damage to the Key.
  • Re-Install latest key software: https://www.tosibox.com/documentation-and-downloads/

On Windows 10 make sure SmartCard service is started and running:

Open task manager - go to services tab - find SCardSvr

To start service ScardSvr - right mouseclick - start

To configure service - right mouseclick - open services - find & open smart card service  - select startup type

In German Windows 10 it looks like: 

If it still not works and if there is no physical damage to the Key and it does not work on any computer but other Keys work, contact your reseller.