The prerequisites required for MTDVAT authorisation setup are the following:
1. HMRC MTD account User ID
2. HMRC MTD account Password.
" To obtain the HMRC MTD account and password, you’ll need to create an HMRC account afresh for MTD services." In order to do so, Please visit
https://www.gov.https://www.gov.uk/register-for-vatuk/register-for-vat
https://www.gov.uk/guidance/making-tax-digital-for-vat-as-an-agent-step-by-step