Leo does the same username/password work when accessing your account's API but not through the Qualys TA? If yes, then there's a problem with the Qualys TA.
You can try resetting your password by going to https://qualysguard.qg2.apps.qualys.com/qglogin/index.html, putting in your username and clicking on "Forgot Password?" right below the Login button.
You can also contact your Qualys TAM or Qualys Support to ensure it's not an issue with your username and password. Regards, John.
... View more