Symantec Corporation has acknowledged that the above mentioned issue is present in all current 10.x versions of PGP Desktop and PGP Whole Disk Encryption. This feature was discontinued since PGP Desktop version 10. The issue is the feature is still present in the PGP Desktop user interface, but does not work as expected. Since the feature was discontinued there will be no fix available in the future. Symantec recommends using other authentication methods, such as eToken/smartcards, SSO or Passphrase authentication. The USB two factor authentication method option will be removed from the PGP Desktop user interface in one of the upcoming releases.