Hi,

I have been trying to send my VAT return but I am continually getting the message 'An error has occurred when communicating with the submission service. Please try again later'.  The details say 'unauthorized'.  My last 3 VAT submissions were done under MTD and have been received.  I phoned HMRC who have confirmed I am set up correctly for MTD and say they can't see any reason why it won't send and to get in touch with Sage. I hope someone is able to help me. Thank you. Lucy