Have been tasked with setting up interoperation of a client's system with HMRC.
I've been able to successfully interoperate with HMRC once - submitting a VAT return and getting the success message.
My issue now is that when i repeat the actions provided in this link:
https://learn.microsoft.com/en-us/dynamics365/finance/localizations/emea-gbr-mtd-vat-integration-submission
I can't seem to get past this stage where it creates the new electronic message /New Vat return/.
1. Creating a new test user