Currently, the SSO integration in Thread Inbox only supports authentication with the tenant it was originally registered with. Users attempting to login from other tenants receive errors, causing disruptions for co-managed users. This limitation hinders the seamless experience for organizations managing external users.

Proposed Feature: Implement a feature that allows Thread Inbox to support multi-tenant SSO. This feature should recognize when a user belongs to an external tenant and correctly handle the authentication loop, enabling both internal and external users to log in without encountering errors.