Customer Acceptance of the MCA has been a non-enforced condition of the Microsoft CSP channel. It is part of the Microsoft Cloud Reseller Agreement for indirect resellers to ensure that their customers have agreed to MCA prior to placing any orders (Microsoft Cloud Reseller Agreement, clause 4.a.).
Microsoft has now announced that this condition will now be enforced, and that Indirect Resellers will be required to provide details of the end customer who has accepted these terms before orders are placed. The requirement will become mandatory starting November 7, 2018.