I have the same problem. HMRC list Express Accounts as MTD-compatible, but they have told me that there must be a problem with the software. NCH say "we have reported this issue to our developers, once we have feedback we will get back to you !" My concern is that HMRC will start charging penalties if this is not resolved by my first MTD VAT Return deadline. I have so far bought 2 updates for Express Accounts: the first to enable me to use MTD, the second to see if the latest version works with MTD. Any suggestions would be most welcome.