Learn Editor: Update understand-mca-roles.md

Author: jkinma39

articles/cost-management-billing/manage/understand-mca-roles.md

@@ -25,6 +25,7 @@ Watch the [Manage access to your MCA billing account](https://www.youtube.com/wa
 
 The following table describes the billing roles you use to manage your billing account, billing profiles, and invoice sections. Permissions granted at the billing account level have the highest level of permission and will inherit permission on all billing groups and invoice sections under that billing account. These inherited permissions cannot be removed at the lower level as they are linked to the role granted at the higher level. If a user only needs access to a specific billing profile or invoice section, grant permission at that level rather than providing access at the billing account scope.
 
+
 |Role|Description|
 |---|---|
 |Billing account owner |Manage everything for billing account|
@@ -211,6 +212,9 @@ To assign billing roles, you might need to use a specific navigation path in the
 6. To remove access for a user, select the user with the role assignment you want to remove. At the top of the page, select **Remove**.  
    :::image type="content" border="true" source="./media/understand-mca-roles/billing-remove-admin.png" alt-text="Screenshot that shows removing an admin from a billing account." lightbox="./media/understand-mca-roles/billing-remove-admin.png":::
 
+>[!NOTE]
+> You'll need to keep one user with “This scope” permissions. Removing the last user with this scope is not allowed.
+
 ## Check access to a Microsoft Customer Agreement
 [!INCLUDE [billing-check-mca](../../../includes/billing-check-mca.md)]