Please correctly enter the Agent Reference Number (ARN) and Re-Authorise
Process 1: HMRC MTD Agent Grant Authorisation To use the Agent Authorisation Service, you need to obtain HMRC Authorisation by doing MTD Agent Grant Authorisation, which will allow our server to interact with HMRC on your behalf.
Process 2: Verification of Agent Reference Number (ARN) You’ll need an Agent Reference Number from HMRC to complete Agent Grant Authorisation. Please carefully enter your correct Agent Reference Number (ARN) details below.