This is a Production Ready Preview feature for companies using direct integration of their cloud-based Dynamics 365 Finance with MTD VAT APIs of HMRC. When you enable the 'Security enhancements in UK MTD VAT integration' feature, your 'UK MTD VAT TEST' and 'UK MTD VAT returns' electronic messaging processing will automatically update to enhance the security of your Dynamics 365 Finance integration for direct VAT return submissions for your UK VAT registration. The following actions of type 'Web service' have been changed to 'Executable class': Retrieve VAT obligations, Test retrieve VAT obligations, Submit VAT return, Test submit VAT return, Request VAT liabilities, Request VAT payments. Once the 'Security Enhancements in UK MTD VAT Integration' feature is enabled, it cannot be disabled.