Hello,
I was able to solve the problem.
Authorized Javascript Origins (Note this is just the domain, not the full path to your site)
For the first field you add your domain, even if you have installed the forum in a subdomain, you add the main domain
For the second field, you will add the domain of your forum + /applications/core/interface/google/auth.php
In the example of IPS they create in the domain community, which is not the case of almost anyone, so I was in trouble.
In my case it stayed
1 - https://eusouandroid.co
2 - http://forum.eusouandroid.co/applications/core/interface/google/auth.php