Merge branch '271572-docs-feedback-saml-sso-and-scim-user-management-update' into 'master'

Resolve "Docs feedback: SAML SSO and SCIM user management update"

See merge request gitlab-org/gitlab!67838

doc/user/group/saml_sso/scim_setup.md

@@ -59,6 +59,7 @@ During this configuration, note the following:
   [previous step](#gitlab-configuration).
 - It is recommended to set a notification email and check the **Send an email notification when a failure occurs** checkbox.
 - For mappings, we will only leave `Synchronize Azure Active Directory Users to AppName` enabled.
+  - `Synchronize Azure Active Directory Groups to AppName` should be disabled. However, this does not mean Azure AD users cannot be provisioned in groups. Leaving it enabled does not break the SCIM user provisioning, but causes errors in Azure AD that may be confusing and misleading.
 
 You can then test the connection by clicking on **Test Connection**. If the connection is successful, be sure to save your configuration before moving on. See below for [troubleshooting](#troubleshooting).
 
@@ -71,11 +72,11 @@ your SAML configuration differs from [the recommended SAML settings](index.md#az
 modify the corresponding `customappsso` settings accordingly. If a mapping is not listed in the
 table, use the Azure defaults.
 
-| Azure Active Directory Attribute | `customappsso` Attribute | Matching precedence |
-| -------------------------------- | ---------------------- | -------------------- |
-| `objectId`                       | `externalId`           | 1 |
-| `userPrincipalName`              | `emails[type eq "work"].value` |  |
-| `mailNickname`                   | `userName`             |  |
+| Azure Active Directory Attribute | `customappsso` Attribute       | Matching precedence |
+| -------------------------------- | ------------------------------ | ------------------- |
+| `objectId`                       | `externalId`                   | 1                   |
+| `userPrincipalName`              | `emails[type eq "work"].value` |                     |
+| `mailNickname`                   | `userName`                     |                     |
 
 For guidance, you can view [an example configuration in the troubleshooting reference](../../../administration/troubleshooting/group_saml_scim.md#azure-active-directory).
 
@@ -162,6 +163,11 @@ graph TD
   B -->|Yes| D[GitLab sends message back 'Email exists']
 ```
 
+During provisioning, note the following:
+
+- Both primary and secondary emails are considered when checking whether a GitLab user account exists.
+- Duplicate usernames are also handled, by adding suffix `1` upon user creation. E.g. due to already existing `test_user` username, `test_user1` is used).
+
 As long as [Group SAML](index.md) has been configured, existing GitLab.com users can link to their accounts in one of the following ways:
 
 - By updating their *primary* email address in their GitLab.com user account to match their identity provider's user profile email address.
@@ -183,13 +189,12 @@ For role information, please see the [Group SAML page](index.md#user-access-and-
 
 ### Blocking access
 
-To rescind access to the group, remove the user from the identity
-provider or users list for the specific app.
-
-Upon the next sync, the user is deprovisioned, which means that the user is removed from the group.
+To rescind access to the top-level group and all sub-groups and projects remove or deactivate the user on the identity provider.
+SCIM providers will generally update GitLab with the changes on-demand, which is minutes at most.
+The user's membership is revoked and they immediately lose access.
 
 NOTE:
-Deprovisioning does not delete the user account.
+Deprovisioning does not delete the GitLab user account.
 
 ```mermaid
 graph TD
@@ -260,9 +265,9 @@ Alternatively, users can be removed from the SCIM app which de-links all removed
 
 Changing the SAML or SCIM configuration or provider can cause the following problems:
 
-| Problem                                                                      | Solution           |
-|------------------------------------------------------------------------------|--------------------|
-| SAML and SCIM identity mismatch. | First [verify that the user's SAML NameId matches the SCIM externalId](#how-do-i-verify-users-saml-nameid-matches-the-scim-externalid) and then [update or fix the mismatched SCIM externalId and SAML NameId](#update-or-fix-mismatched-scim-externalid-and-saml-nameid). |
+| Problem                                                                   | Solution                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+| ------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| SAML and SCIM identity mismatch.                                          | First [verify that the user's SAML NameId matches the SCIM externalId](#how-do-i-verify-users-saml-nameid-matches-the-scim-externalid) and then [update or fix the mismatched SCIM externalId and SAML NameId](#update-or-fix-mismatched-scim-externalid-and-saml-nameid).                                                                                                                                                                              |
 | SCIM identity mismatch between GitLab and the Identify Provider SCIM app. | You can confirm whether you're hitting the error because of your SCIM identity mismatch between your SCIM app and GitLab.com by using [SCIM API](../../../api/scim.md#update-a-single-scim-provisioned-user) which shows up in the `id` key and compares it with the user `externalId` in the SCIM app. You can use the same [SCIM API](../../../api/scim.md#update-a-single-scim-provisioned-user) to update the SCIM `id` for the user on GitLab.com. |
 
 ### Azure