Register Preprod at LHDN website. Refer PDF below for further guide (01 - FAQ_Add Access as Intermediary in MyInvois[1]). Image below as reference on how you should fill in the “Add Intermediary” section on Preprod website.
Register On-Boarding, at https://www.theaccessgroup.com/en-my/finance/form/einvoicing-onboarding/?utm_source=marketo&utm_medium=email&utm_campaign=FY25-P05-AVC-EB-O-OTHER-UBSPhase2Onboarding-US-ERP-MY and wait until the HQ reply.