Whenever your SignOn is locked it means you have tried access several times using a wrong password and therefore for security reasons your GDS got you blocked.
GDS leads you to the same blocked status either through normal desktop or Travelport Mobile Agent / TTS Web Agent.
Since that is a Travelport issue to which TTS does not have access, you'll have to contact Travelport Helpdesk to get your SON/BSI unlocked otherwise you will not manage to work not even through Desktop.
For Worldspan users:
Travelport Helpdesk shall unlock your SignOn using the Device address/LEID number assigned to TMA - Please check data provided on activation email sent by TTS.
Please be so kind to address yourself to Travelport Helpdesk or get more information at ASK Travelport.