Update articles/active-directory-b2c/phone-based-mfa.md

Co-authored-by: Kenga Derdus <[email protected]>

Author: bernawy

articles/active-directory-b2c/phone-based-mfa.md

@@ -148,8 +148,7 @@ To help prevent fraudulent sign-ups, remove any country/region codes that do not
 1. In the `BuildingBlocks` section of this policy file, add the following code. Make sure to include only the country/region codes relevant to your organization:
 
   > [!IMPORTANT]
-  > This code must be added to the **relying party policy** to ensure the country/region code restrictions are properly enforced on the server side.
-  > Defining these elements only in the parent policies will not work; they **must be added to the relying party policy**.
+>Add this code to the _relying party policy_ to enforce country/region code restrictions on the server side. You must not define these elements only in parent policies; put them in the relying party policy.
 
    ```xml
     <BuildingBlocks>