Merge pull request #112674 from ArvindHarinder1/patch-108

Update customize-application-attributes.md

Author: PRMerger14

articles/active-directory/app-provisioning/customize-application-attributes.md

@@ -69,7 +69,7 @@ Along with this property, attribute-mappings also support the following attribut
 - **Target attribute** – The user attribute in the target system (example: ServiceNow).
 - **Default value if null (optional)** - The value that will be passed to the target system if the source attribute is null. This value will only be provisioned when a user is created. The "default value when null" will not be provisioned when updating an existing user. If, for example, you want to provision all existing users in the target system with a particular Job Title (when it is null in the source system), you can use the following [expression](../app-provisioning/functions-for-customizing-application-data.md): Switch(IsPresent([jobTitle]), "DefaultValue", "True", [jobTitle]). Make sure to replace the "Default Value" with what you would like to provision when null in the source system. 
 - **Match objects using this attribute** – Whether this mapping should be used to uniquely identify users between the source and target systems. It's typically set on the userPrincipalName or mail attribute in Azure AD, which is typically mapped to a username field in a target application.
-- **Matching precedence** – Multiple matching attributes can be set. When there are multiple, they're evaluated in the order defined by this field. As soon as a match is found, no further matching attributes are evaluated.
+- **Matching precedence** – Multiple matching attributes can be set. When there are multiple, they're evaluated in the order defined by this field. As soon as a match is found, no further matching attributes are evaluated. While you can set as many matching attributes as you would like, consider whether the attributes you are using as matching attributes are truly unique and need to be matching attributes. Generally customers have 1 or 2 matching attributes in their configuration. 
 - **Apply this mapping**
   - **Always** – Apply this mapping on both user creation and update actions.
   - **Only during creation** - Apply this mapping only on user creation actions.
@@ -312,8 +312,10 @@ Selecting this option will effectively force a resynchronization of all users wh
 - Updating attribute-mappings has an impact on the performance of a synchronization cycle. An update to the attribute-mapping configuration requires all managed objects to be reevaluated.
 - A recommended best practice is to keep the number of consecutive changes to your attribute-mappings at a minimum.
 - Adding a photo attribute to be provisioned to an app is not supported today as you cannot specify the format to sync the photo. You can request the feature on [User Voice](https://feedback.azure.com/forums/169401-azure-active-directory)
-- The attribute IsSoftDeleted is often part of the default mappings for an application. IsSoftdeleted can be true in one of four scenarios (the user is out of scope due to being unassigned from the application, the user is out of scope due to not meeting a scoping filter, the user has been soft deleted in Azure AD, or the property AccountEnabled is set to false on the user). 
-- The Azure AD provisioning service does not support provisioning null values
+- The attribute IsSoftDeleted is often part of the default mappings for an application. IsSoftdeleted can be true in one of four scenarios (the user is out of scope due to being unassigned from the application, the user is out of scope due to not meeting a scoping filter, the user has been soft deleted in Azure AD, or the property AccountEnabled is set to false on the user). It is not recommended to remove the IsSoftDeleted attribute from your attribute mappings.
+- The Azure AD provisioning service does not support provisioning null values.
+- They primary key, typically "ID", should not be included as a target attribute in your attribute mappings. 
+- The role attribute typically needs to be mapped using an expression, rather than a direct mapping. See section above for more details on role mapping. 
 
 ## Next steps