Hello, Yes FusionAuth does have an equivalent feature to Auth0 Organizations in the form of "Tenants." Tenants in FusionAuth allow you to logically separate different groups of users or organizations within the same FusionAuth instance. Each tenant can have its own configuration settings, users, roles, and permissions.

With FusionAuth, you can invite pre-registered users by sending email invitations. These invitations can be configured with specific roles and associated with the same organization or company. This allows users to log in and be part of the same organization or company as their team members or colleagues.

In summary, FusionAuth provides the capability to create separate tenants for different organizations, and invitations can be sent to pre-registered users under the same organization with specific roles assigned.