To solve this quest and advance the story, you must pick a subscription plan, even though you are supposed to be in a free play period.
Game developers are notoriously skittish, and in order to win their trust you must demonstrate an ability to pay your bills 30 days from now.
When in this timid state, developers lose much of their english, which is why you were told your login information is incorrect, instead of being accurately told that you need a subscription plan.