FitGrid has multiple applications: FitGrid Pro for Instructors, Studio for Managers, and Class App for Customers. If you receive an error when trying to register for the Class App that you are not able to register and/or that your access credentials are invalid, this may mean the email you are registering with has been previously registered for the Pro or Studio applications.
The email for the Class App must be different from these other applications. Please register with a different email. You can still use the initial email when connecting studios to your profile.