As a Trello Premium admin, when I invite new users to my workspace they get an email with a link they can follow. When they follow the link, the page shows that they don't have access and gives them an option to log in.

This is a very confusing experience for someone who hasn't used Trello before. They don't have a login for one, and there's no indication that what they need to do is click the login link and sign up for a new account.
Does anyone have any guidance on how to improve this experience for my new users?