If you’re wondering why you were not asked for your Authenticator on login, the game now looks to see if the IP and Etc are all typical, and if so – does not ask.
I freaked a little, as I thought it was being applied with patch 4.2. and almost expected to see my toons naked.
TyphoonAndrew's - Eye of the Storm 
I didn’t even notice it at first (!). Then I freaked. Now I LOVE it and wonder, what the hell took so long for them to figure THAT out? Nobody’s going to hack me from my own damn computer.
So, instead of an Authenticator, why can’t I just choose the option: “accept login from this IP address only”, and lock that in with a phone call or something?