I am in middle of setting up team viewer. I installed a 2 step authenticator on my phone, and successfully scanned the code on my computer screen. Team viewer is now an active account on my authenticator app.
I even have the emergency recovery code if I lose my authenticator app.
However, when I log in to my TV account, it still says "activate" next to 2 step authentication?! and loging in is not requiring 2-steps.