Merge pull request #109229 from MicrosoftGuyJFlo/PR108516

[Azure AD] Conditional Access - PR108516

Author: PRMerger18

articles/active-directory/conditional-access/block-legacy-authentication.md

@@ -6,7 +6,7 @@ services: active-directory
 ms.service: active-directory
 ms.subservice: conditional-access
 ms.topic: conceptual
-ms.date: 03/25/2020
+ms.date: 03/26/2020
 
 ms.author: joflore
 author: MicrosoftGuyJFlo
@@ -73,6 +73,8 @@ The following options are considered legacy authentication protocols
 - Reporting Web Services - Used to retrieve report data in Exchange Online.
 - Other clients - Other protocols identified as utilizing legacy authentication.
 
+For more information about these authentication protocols and services, see [Sign-in activity reports in the Azure Active Directory portal](../reports-monitoring/concept-sign-ins.md#filter-sign-in-activities).
+
 ### Identify legacy authentication use
 
 Before you can block legacy authentication in your directory, you need to first understand if your users have apps that use legacy authentication and how it affects your overall directory. Azure AD sign-in logs can be used to understand if you're using legacy authentication.