Document that Okta plus Entra is not supported for IAM (#55565)

content/admin/managing-iam/provisioning-user-accounts-with-scim/configuring-scim-provisioning-for-users.md

@@ -176,6 +176,8 @@ To use a partner IdP's application for both authentication and provisioning, rev
 
 If you don't use a partner IdP, or if you only use a partner IdP for authentication, you can manage the lifecycle of user accounts using {% data variables.product.company_short %}'s REST API endpoints for SCIM provisioning. See [AUTOTITLE](/admin/identity-and-access-management/provisioning-user-accounts-for-enterprise-managed-users/provisioning-users-and-groups-with-scim-using-the-rest-api).
 
+{% data reusables.emus.mixed-systems-note %}
+
 {% ifversion emu-public-scim-schema %}
 
 {% data reusables.emus.sign-in-as-setup-user %}

content/admin/managing-iam/provisioning-user-accounts-with-scim/provisioning-users-and-groups-with-scim-using-the-rest-api.md

@@ -57,15 +57,15 @@ When you configure authentication and provisioning for your enterprise, you can
 
 ### Using a partner identity provider
 
-Each partner IdP provides a "paved-path" application, which implements both SSO and user lifecycle management. To simplify configuration, {% data variables.product.company_short %} recommends that you use a partner IdP's application for both authentication and provisioning. For more information and a list of partner IdPs, see {% ifversion ghec %}[AUTOTITLE](/admin/identity-and-access-management/understanding-iam-for-enterprises/about-enterprise-managed-users#identity-management-systems).{% else %}[AUTOTITLE](/admin/managing-iam/provisioning-user-accounts-with-scim/user-provisioning-with-scim-on-ghes#supported-identity-providers).{% endif %}
+Each partner IdP provides a "paved-path" application, which implements both SSO and user lifecycle management. To simplify configuration, {% data variables.product.company_short %} recommends that you use a single partner IdP application for both authentication and provisioning. For more information and a list of partner IdPs, see {% ifversion ghec %}[AUTOTITLE](/admin/identity-and-access-management/understanding-iam-for-enterprises/about-enterprise-managed-users#identity-management-systems).{% else %}[AUTOTITLE](/admin/managing-iam/provisioning-user-accounts-with-scim/user-provisioning-with-scim-on-ghes#supported-identity-providers).{% endif %}
 
 For more information about configuring SCIM provisioning using a partner IdP, see [AUTOTITLE](/admin/identity-and-access-management/provisioning-user-accounts-for-enterprise-managed-users/configuring-scim-provisioning-for-enterprise-managed-users).
 
 ### Using other identity management systems
 
-If you cannot use a partner IdP for both authentication and provisioning due to migration overhead, licensing costs, or organizational inertia, you can use another identity management system or combination of systems. The systems must provide authentication using SAML and user lifecycle management using SCIM, and must adhere to {% data variables.product.company_short %}'s integration guidelines.
+If you cannot use a single partner IdP for both authentication and provisioning due to migration overhead, licensing costs, or organizational inertia, you can use another identity management system or combination of systems. The systems must provide authentication using SAML and user lifecycle management using SCIM, and must adhere to {% data variables.product.company_short %}'s integration guidelines.
 
-{% data variables.product.company_short %} has not tested integration with every identity management system. While integration with {% ifversion ghec %}{% data variables.product.prodname_emus %}{% else %}{% data variables.product.prodname_ghe_server %}{% endif %} may be possible, {% data variables.product.company_short %}'s support team may not be able to assist you with issues related to these systems. If you need help with an identity management system that's not a partner IdP, or if you use a partner IdP only for SAML authentication, you must consult the system's documentation, support team, or other resources.
+{% data reusables.emus.mixed-systems-note %}
 
 ## Prerequisites
 

content/admin/managing-iam/understanding-iam-for-enterprises/about-enterprise-managed-users.md

@@ -65,7 +65,7 @@ If you cannot use a single partner IdP for both authentication and provisioning,
 * Provide **authentication using SAML**, adhering to SAML 2.0 specification
 * Provide **user lifecycle management using SCIM**, adhering to the SCIM 2.0 specification and communicating with {% data variables.product.company_short %}'s REST API (see [AUTOTITLE](/admin/identity-and-access-management/provisioning-user-accounts-for-enterprise-managed-users/provisioning-users-with-scim-using-the-rest-api))
 
-{% data variables.product.company_short %} does not expressly support mixing and matching partner IdPs for authentication and provisioning and does not test all identity management systems. **{% data variables.product.company_short %}'s support team may not be able to assist you with issues related to mixed or untested systems.** If you need help, you must consult the system's documentation, support team, or other resources.
+{% data reusables.emus.mixed-systems-note %}
 
 ## Usernames and profile information
 

data/reusables/emus/mixed-systems-note.md

@@ -0,0 +1,3 @@
+{% data variables.product.company_short %} does not expressly support mixing partner IdPs for authentication and provisioning and does not test all identity management systems. **{% data variables.product.company_short %}'s support team may not be able to assist you with issues related to mixed or untested systems.** If you need help, you must consult the system's documentation, support team, or other resources.
+
+>[!IMPORTANT] The combination of **Okta and Entra ID** for SSO and SCIM (in either order) is explicitly **not supported**. {% data variables.product.github %}'s SCIM API will return an error to the identity provider on provisioning attempts if this combination is configured.