It means exactly that! In other words, it’s not a bug but a notification. SwimTopia uses email addresses as the login rather than some made-up identity because email addresses are guaranteed to be unique. While it’s possible for people to share an email address (firstname.lastname@example.org) there can only be one such email address in existence, much like a mailing address.
This message appears most often when manually adding a person from the People tab. If you experience this, the most likely reason is that the person is a member in a previous season. Use the search bar in People to find the person in another season:
If you don’t find them in one season, search other seasons. Once you find them in a previous season, add them to the current season. See the Help Center article: Managing People > Adding a Season Affiliation
SwimTopia does a pretty good job of matching people, using first and last names plus the email address during registration to find existing registrants. Otherwise, if the first and last names are identical to other registrations, the system automatically manages things. So if the information isn’t identical—“Samuel” in one instance and “Sam” in another, or more commonly, Wilma registered with the “theflintstones” address one year and Fred is trying to use it this year (or on a different SwimTopia team). At the moment, this is not the case when manually adding a person.
If you can’t make this work, please contact your friendly customer happiness person via email@example.com and provide the email address that’s proving troublesome along with as much other information as possible so we can find the person in our system and clean things up. No screenshots are required.