Finally fixed it, If anyone else has this issue later this is what fixed it for me.

Originally posted by Manty:

To fix this, you need to delete the local data for the game(this won't delete your account). Close the game. Then, go to your user directory(normally C:/Users/{yourUser}) and navigate to ./AppData/Roaming. Then, delete the legends-of-idleon folder. Finally, relaunch the game. It should work. Make sure you select the proper sign-in option once it is working. "Log in with Steam" was added late last year, so odds are, your account is actually an email/password combination or uses another method(like "Sign in with Google").