In what cases would a new constituent be created when registering for a TeamRaiser? In what cases would a new constituent record not be created?
By default, a new constituent record would be created if a user registers and selects the option to participate as a new user and registers with a different name or email address that does not match the existing constituent record.
A constituent record will not be created if the user registers as a returning participant. If the user registers as a new user with the same name and email address (and username depending on the TeamRaiser setup), then a new constituent record will not be created.