Has anyone encountered this. In the encryption users section of ePO 5.3.1, if you try to manually add a user to a system, the list never populates in IE11. This only happens in IE11, not Chrome, FF or Edge.
Check and see if you can create a User Based Policy Assignment Rule for a user. Policy Assignment Rules use the same ePO LDAP browser as MDE uses to assign users. If the same behavior is seen, you will want to cross post over to the ePO forum.