Google 2fa doesn't work when logging in?

I'm using google 2fa for my account, but when logging in the game when asked for the code it fails most of the times.
It works absolutely fine when logging into the site itself, only when logging into the game it fails.

Is this a issue on my side or has this happened to anybody else?

What do you mean by "It Fails"?
If you used it on a one IP address it normally wont ask you to authenticate again until your IP address changes or at least as I understand it.