Update customer-managed-keys-cross-tenant.md

Author: netapp-manishc

articles/azure-netapp-files/customer-managed-keys-cross-tenant.md

@@ -196,6 +196,9 @@ az netappfiles account show \
 ```
 If `federatedClientId` is missing, the account is configured with the same-tenant CMK and not with cross-tenant CMK.
 
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 ### Missing Key URI or Encryption Key Source option in the portal
 
 **Symptom:** When creating a volume in the Azure portal, the **Encryption Key Source** dropdown menu doesn't show **Customer-Managed Key**, or fields for **Key URI**, **subscription**, or **identity type** aren't visible.