NnN

Hello, Have had the same issue, I called HMRC and was told to complete CA8421and CA8454. This afternoon I received a letter saying that HMRC cannot issue the certificate as impossible to confirm my UK immigration status, using the information provided on the application... I was advised to complete a new application and send copies of relevant documents confirming my status! Needless to say that Frontier worker permit is not on the list of the required documents. Very frustrating. I hope the issue will be resolved ASAP.