Hello Emma, I have exactly the same issue as "Kudos" - I was using desktop version 2016, 3 x users on different computers, registered for electronic filing with Hmrc, have the confirmation email, and tried to file vat to get the same agent type error message. I have spent the last 4 days trying to upload to q/books online without success, have now upgraded to trial 2019, still get the same message, have been submitting vat returns for many years, no mention of the mtd option when I file! All help and advice needed soonest Thanks  Richard