Log in issue with Google connect

I can’t log in with my another account which uses Google connect. This is my sub account.
When I attempted to log in, it showed me a pop-up window about End User License Agreement all of sudden. It has never happened. Anyways, I checked 3 of them and clicked “I Agree” button. And then, it showed me Sign Up pop-up window instead of Sign In window. So, I can’t log in.

Has Epic Games changed a policy recently? What should I do?
Plus, I’m gonna stop using Google connect from now, but I’ll still use the same Gmail address. In this case, what should I do?