As I didin't find solution to ingame login with google authenticator, I'll write it up here.

If you been using google authenticator, you probably experienced this problem.

You can login on Warmane website with the generated code, but not ingame.

The solution is following:

To login on website, use the code CURRENTLY generated.

To login ingame, you write the code CURRENTLY generated, then you need to wait until NEW one is generated, and login with the one PREVIUSLY generated one.

So to speak, to login ingame, you need to use previous code, not current one.

Merry Christmas.