I think it'll help, so I'm leaving it.
If you can't log in from the app after signing up for Epic Games, (if there's a Google login error)
After accessing Epic Games website (
www.epicgames.com) on the internet,
1. Log in in in the way you signed up (e.g. Google),
2. Try setting a new password in the upper right account > password and security tab!
And then log in to Epic Games on the app (not SNS, but Epic Games at the top).
Enter the email address you signed up for and the password you just set to log in!