add multi-node requirement

Author: paigecalvert

docs/enterprise/embedded-manage-nodes.mdx

@@ -18,6 +18,10 @@ Multi-node clusters with Embedded Cluster have the following limitations:
 
 * Setting node roles with the Embedded Cluster Config [roles](/reference/embedded-config#roles) key is Beta.
 
+## Requirements
+
+To deploy multi-node clusters with Embedded Cluster, the **Embedded Cluster Multi-Node** license field must be enabled for the customer. For more information about managing customer licenses, see [Create and Manage Customers](/vendor/releases-creating-customer).
+
 ## Add Nodes to a Cluster (Beta) {#add-nodes}
 
 You can add nodes to create a multi-node cluster in online (internet-connected) and air-gapped (limited or no outbound internet access) environments. The Admin Console provides the join command that you use to join nodes to the cluster.