Remediation
A tenant places each new subscription under one of two scopes: the root management group, or another management group the organization designates. The Default management group hierarchy setting selects between them for the whole tenant. Prerequisites: Create the management group that will receive new subscriptions and assign it the policies and role assignments that new subscriptions must carry.
Using an account with Hierarchy Settings Administrator or Owner access on the root management group, open Management groups, select the root group, and open Settings. Choose Change default management group, select the designated group, and save the selection. Verify the hierarchy setting and the placement of a newly created subscription.
Automated assessment is unavailable: Tenant default management-group setting is not collected; current subscription membership does not establish the default for new subscriptions.