Authenticator doesnt show in game!

Ok so i have a problem, i have setup the google authenticator on my account a while back and it worked just fine.... showed in game and was asked for it on site, but now i had to reinstal my windows and when i instaled the client again i dont get asked to input authenticator in game nor on site anymore... i dont get why and if this is not a bug what stops somebody just downloading a client and hacking in to my account? And when i try to enable it again it says i have it on allready...

Looking forward to your respond.

It remembers your IP. If your IP changes it will ask for the code.
If your user client changes (switching OS) asks for code on the website, but ingame it's just the IP.

After 2 days of playing authenticator showed up... so nvm just needed time...