After adding an additional host to vCenter the newly added host is not able to see the vVol datastore that is present on the other hosts in the cluster.
VMware ESXI (all versions)
The vVols datastore will not be automatic mounted on the new host for use and will need to be mounted via the “Mount Datastore to Additional Hosts” Procedure.
Mount the vVols datastore to the host/hosts that require access.
If you have unmounted a vVols datastore from all hosts, the datastore disappears from the inventory. To mount the vVols datastore that has been removed from the inventory, use the New Datastore wizard.
Create a Virtual Volumes Datastore in vSphere Environment
If you are having issues with the mount process please review the following kbs.
ESXi 7.X and later host newly added to vCenter is unable to access vVOl datastore
Mounting vVOL datastore on new ESXi hosts fails with "General System Error"