Multi-Tenant Single Sign-On (SSO) allows an application to serve multiple distinct organizations (tenants) while letting each organization authenticate users through their own identity provider. It securely validates user access across isolated environments using standardized protocols like SAML or OIDC. ^1.

How Multi-Tenant SSO Works
The Application: A single instance of software serves all tenants, but each tenant retains logically separated settings and data. ^2.
Federated Identity: The application integrates with multiple Identity Providers (IdPs) like Microsoft Entra ID, Okta, or Google Workspace. ^3. 
Routing: When a user attempts to log in, the application determines their organization (usually via their email domain or a custom tenant URL) and securely redirects them to their specific corporate IdP.  ^4.
Verification: The user logs in at their company portal and sends a digitally signed token back to the application to grant access. ^5.
 

1. https://securityboulevard.com/2026/04/multi-tenant-saas-and-single-sign-on-sso/

2. https://securityboulevard.com/2026/04/multi-tenant-saas-and-single-sign-on-sso/

3. https://www.youtube.com/watch?v=LtEqmidxlOQ

4. https://www.youtube.com/watch?v=LtEqmidxlOQ
6. https://support.builtintelligence.com/hc/en-gb/articles/19440144006429-Multi-Tenant-SSO-Explanation