Is it possible to move an Azure MCA subscription to a CSP

Yes, you can do that by doing a billing change. It's described here. https://docs.microsoft.com/en-us/azure/cost-management-billing/manage/transfer-subscriptions-subscribers-csp#transfer-ea-subscriptions-to-a-csp-partner Basically, for the matrix, you can do a EA (MCA/SCE) to CSP and from PAYG to EA. You will keep your subscription ID in the process, and with no downtime for the users. The process from EA to CSP has to be initated from your CSP partner. All other migrations are ressource by ressource migrations