Why does Easy MTD VAT state authority is required?
Before Easy MTD VAT can be used to view obligations, liabilities and payments, and submit VAT returns for a business, authority must be granted to Easy MTD VAT to interact with HMRC on behalf of the business.
If you have previously granted authority for the selected business, it is likely you are getting prompted to do so again because the authority has expired (authority is valid for 18 months then it must be renewed).
MORE: For further details about granting authority, refer to the Granting Authority section of the help or the Grant Authority section of the step-by-step guide.