Adding an ESXi host with version prior to 8.0u3 to single image cluster fails with error : "Host cannot be added to the cluster. Host x.x.x.x with ESXi version # cannot be added to the cluster. Clusters managed by vSphere Configuration Profiles but not by vLCM require minimum ESXi version 8.0.3"
The hosts are currently running an ESXi version prior to 8.0u3 which is not supported with single image cluster and Configuration Profiles, as this requires ESXi 8.0.3 or later - Using vSphere Configuration Profiles to Manage Host Configuration at a Cluster Level
Upgrade ESXI Host to version 8.0.3 or above
If the upgrade is not possible immediately, below steps can be followed to workaround the issue :
Note : With the launch of vSphere 8.0, we are announcing the deprecation of vSphere Lifecycle Manager Baselines (previously known as vSphere Update Manager VUM). The capability will continue to be supported, and will remain in the product, and is available for use in vSphere 8, until its removal in the next Major release of vSphere.