I just noticed that the "Log In with Google" with google button is not working. I though it was just my site with my browser but I tried also on here(xenforo.com) and it was not working in IE and chrome. Basically I am just clicking on the button without any loading screen or any response.
Ahh nm, its working now on all browsers and PCs I tested on including phone, before it was not working anywhere. Must have a been a Google thing that lasted at least 5 minutes for me as I was testing in different places.
You must make sure it's the same url you used in the Google Developers Console , either with www. prefix or without the www.
eg: www.xenforo.com or xenforo.com . So if you set it up with www.xenforo.com it will work but if you access the website using just xenforo.com you'd get an error.