While the AKS Cluster status is healthy and data is present in the Nodes Usage/Containers Usage report, the AKS Cost History report is not displaying this information for these Cluster.
Please identify the subscription associated with this cluster. Once you have the subscription details, verify its status on the Asset page. The subscription to which this cluster belongs must be healthy for accurate mapping of billing data (cost) with asset data.
Asset report Link: https://apps.cloudhealthtech.com/assets/azure/subscriptions