In some cases, when you log in to a vCenter Server system by using an LDAP domain with a configured alias and the specified username does not use an alias, you might see an authentication error when you click the Lifecycle Manager icon.
n the vSphere Client, you see the error Authentication failed, Lifecycle Manager server could not be contacted. The issue does not occur when you use a vCenter Single Sign-On internal account or the default admin account
administrator@vsphere.local.