If just doing a general YUM update does not update your Cloud Linux you are not alone. In fact sometimes the LVE manager never installs at all.
Don’t worry though, it’s just one line of code and about 5 minutes to fix.
yum install lvemanager --enablerepo=cloudlinux-updates-testing
If that still does not work try to do a forced CPanel update and then run again.
If that doesn’t work send a message to CPanel or Cliud Linux to ge their stuff to work.