Merge pull request #230323 from Gargi-Sinha/patch-166

Update faq.yml

Author: Court72

articles/active-directory/external-identities/faq.yml

@@ -207,6 +207,10 @@ sections:
           ![Screenshot shows the flow for guest redemption.](media/user-invitation-different-email-upn/guest-redemption.png)
 
           ![Screenshot shows the flow for subsequent sign-ins.](media/user-invitation-different-email-upn/subsequent-sign-in.png)
+          
+          >[!NOTE]
+          >Invitations and redemptions being sent across Microsoft clouds must use UPN. Email is not supported at this time. For example, if a user from a US Government tenant is invited to a Commercial tenant, the user must be invited using their UPN.
+
 
       - question: |
           Instant-on: What can cause replication latency?