HMRC's message · HTTP 400
The provided VRN is invalid
When it appears
Retrieving VAT obligations, liabilities, payments or customer details.
What to check
- The client's VAT number is nine digits, with no GB prefix or spaces.
How to fix it
Correct the VAT number on the client's record.
Making Tax Digital in Accountin
Accountin will send VAT returns and income tax updates to HMRC once HMRC grants it live access. It then shows HMRC's code and message next to a plain explanation, and keeps HMRC's reply against every submission.