Hi,
■ Log in to the vSphere Web Client as a user with permissions on the vCenter Server system. The vCenter Server system will not appear in the inventory if you do not have permissions on it. For example, if you log in as the vCenter Single Sign On administrator user, you might not have permissions on any vCenter Server system.
■ Verify that the vCenter Server system is registered with the same lookup service as the vSphere Web Client. The vSphere Web Client discovers only vCenter Server systems that are registered with the same lookup service