Cluster is not compatible for Workload Management

trying to enable workload management in vsphere 7 but cluster is not compatible.

i validate the following are set: 3 ESXi hosts, DRS on , HA on, NSX-T 3.0 is running with trust enabled , hosts license with VMware vSphere 7 Enterprise Plus with Add-on for Kubernetes

also i'm getting this error when running cluster compatibility from within the vcenter.

|------------|----------|-----------------------------------------------------|

|cluster     |compatible|incompatibility_reasons                              |

|------------|----------|-----------------------------------------------------|

|domain-c2026|False     |Cluster domain-c2026 is missing compatible NSX-T VDS.

any advice what else can be the cause?

thanks