The Admin Subscriptions Management Client.
curl \
-H "Authorization: Bearer $ACCESS_TOKEN" \
/subscriptions/{subscriptionId}/resourcegroups/{resourceGroupName}/providers/Microsoft.Subscriptions.Admin/directoryTenantscurl \
-H "Authorization: Bearer $ACCESS_TOKEN" \
/subscriptions/{subscriptionId}/resourcegroups/{resourceGroupName}/providers/Microsoft.Subscriptions.Admin/directoryTenants/{tenant}