Before you start your integration with FusionAuth you need to setup at least one Application. Applications are the way that FusionAuth manages registrations of a user. If you haven’t read the Overview section yet, it describes the relationship between Users and Applications. An Application in FusionAuth represents an authenticated resource.
The tenant to which this Application will be assigned. This value cannot be changed once the Application is created. This field is only displayed when more than one tenant exists.