Your Authorisation is about to expire in a month,you have to Re-Authorise grant authorisation.
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.