When you registered with Trusona on your workstation, you scanned a QR code that allows you to sign in with a code, aka OTP (One time passcodes).
You can get the OTP by going to the Trusona app and selecting codes. Find your Windows 10 computer name and a 6 digit code will be displayed. Keep in mind, the code will change every 30 seconds.
In order to use the OTP on your computer, click the dropdown next to ‘Sign in with Trusona’ and select Offline sign in. Enter in the 6 digit code from the Trusona app in the offline sign in field.