The platform does support MCA.
It is also important to keep your EA listed within the platform (even if it's Critical) as the platform uses this to keep historical data in place.
For more details on this, see: Are there problems if we delete an expired EA after we move to MCA/Azure plan?
More info on Modern Commerce: https://docs.vmware.com/en/VMware-Aria-Cost/SaaS/getting-started-with-vmware-aria-cost/GUID-managing-azure-accounts.html?hWord=N4IghgNiBcILIHsAmBTATgOwAQGEEFt90BjFLAQQC8BXNFEAXyA#azure-modern-commerce-multi-currency-6