Update concept-mfa-authprovider.md

Author: MicrosoftGuyJFlo

articles/active-directory/authentication/concept-mfa-authprovider.md

@@ -22,7 +22,7 @@ Two-step verification is available by default for global administrators who have
 An Azure Multi-Factor Auth Provider is used to take advantage of features provided by Azure Multi-Factor Authentication for users who **do not have licenses**.
 
 > [!NOTE]
-> Effective September 1st, 2018 new auth providers may no longer be created. Existing auth providers may continue to be used and updated. Multi-factor authentication will continue to be available as a feature in Azure AD Premium licenses.
+> Effective September 1st, 2018 new auth providers may no longer be created. Existing auth providers may continue to be used and updated, but migration is no longer possible. Multi-factor authentication will continue to be available as a feature in Azure AD Premium licenses.
 
 ## Caveats related to the Azure MFA SDK