I just struggled with this, and I’d like to think I’m experienced with WordPress and not that stupid.
My problem was I missed the message about validating my test account, and got distracted by the avator
upload. When tried to login with my test accounts I was simply returned to the homepage with no feedback.
So people have you validated the accounts that your trying to register, and admins can we get a bit of
feedback upon logging in with a non validated account.