Add the multi tenancy page

v2/unified-login/customizations/multi-tenancy.mdx

@@ -0,0 +1,22 @@
+---
+title: Multi Tenancy
+hide_title: true
+---
+
+import MFAPaidBanner from '../../community/reusableMD/mfa/MFAPaidBanner.mdx'
+
+<MFAPaidBanner />
+
+# Multi Tenancy
+
+If you are using a **Multi-Tenant** configuration and you are also implementing your own **custom UI**, you will have to add a tenant discovery process in your authentication flow.
+This information is discussed at large in different pages of the documentation. Follow a specific guide, based on the authentication method that you are using, for more information:
+
+- [Email/Password](/docs/emailpassword/introduction)
+- [Passwordless](/docs/passwordless/introduction)
+- [Thrid Party](/docs/thirdparty/introduction)
+
+One thing to point out here, in the context of **OAuth2**, is that you will have to account for **Clients** passing information about which tenant is being used.
+This is done through the the authorization URL, in the `tenant_id` query parameter.
+The login page must handle the **tenant ID** and ensure it's being passed across different authentication pages through the URL.
+

v2/unified-login/sidebars.js

@@ -20,6 +20,7 @@ module.exports = {
         "customizations/add-custom-claims-in-tokens",
         "customizations/verify-tokens",
         "customizations/custom-ui",
+        "customizations/multi-tenancy",
       ],
     },
   ],