EC Sales submission failure

[Glenn]

The error you’re getting indicates that you’re not enrolled with HMRC to submit electronic EC Sales. Similar to this thread I think.

Vat return - The supplied user credentials failed validation for the requested service

Hi, I have previously submitted two vat returns however I get a failure message and cannot understand why the message I get is Vat return submission to HMRC failed. By Gateway : Authentication Failure. The supplied user credentials failed validation for the requested service.