Merge pull request SharePoint#8662 from westleyMS/patch-17

Update security-apponly-azuread.md

Author: andrewconnell

docs/solution-guidance/security-apponly-azuread.md

@@ -1,7 +1,7 @@
 ---
 title: Granting access via Azure AD App-Only
 description: Granting access via Azure AD App-Only
-ms.date: 06/28/2022
+ms.date: 12/30/2022
 ms.prod: sharepoint
 author: vesajuvonen
 ms.author: vesaj
@@ -32,6 +32,8 @@ To create a self signed certificate with this script:
 
 > [!NOTE]
 > The dates are provided in ISO date format: YYYY-MM-dd
+> 
+> The certificate key algoritm must be RSA, this is the only supported algorithm currently
 
 The actual script can be copied from here: