CelloSaaS enforces unique email address across all the tenants.I.E an email id associated for a user in one tenant cannot be used in another tenant. Is it possible to allow duplicate email id across tenants.
CelloSaaS provides a feature called "User Sharing/Linking" a ability to associate a user of a tenant to more than one Account/Tenant, This feature is primarily relies on unique email address for every user in the system. CelloSaaS framework uses the email id to share/link the users with other tenants, but the shared/adopted user has equal rights like the own user of a particular tenant.
Note: If the shared user is disabled at the parent account (Where he actually belongs to), the user cannot login to the shared tenant as well.