I have tried to submit my client’s VAT returns, but I have received error:
There was a problem submitting your VAT return
Hmrc Error Code: 403
Message: The client and/or agent is not authorised.
I have submitted VAT returns from different software and I am definitely authorised as an agent, I have also checked my client registration and on HMRC website on my account it showed message:
Your client has already signed up
This client’s details are already in use.
Could anyone help me please?