I am trying to request authorisation for a new client (Corporation Tax) through HMRC's online system. I have the UTR from the previous accountants and the registered number from Companies House. However, when I put in these bits of information I get the following error immediately: "ERROR: HM Revenue & Customs is unable to identify your client from the information you have provided. Please check the details you have entered and amend if necessary."
Is this because HMRC thinks the client might still be registered with the previous accountants?
I would phone HMRC and ask but there's no obvious phone number!