[ovirt-users] Hosted Engine can't migrate

I'm new to oVirt, but not new to virtualization technologies. I've run into a wall, but the solution has gotta be simple. I've seen other threads with the same issue, but a solution is never posted. I've followed the guide perfectly. I get the self-hosted engine up and running with no issues. I add hosts to the cluster, but it won't let me migrate the HE because of Hosted Engine HA score of "N/A" on every host except the one it was initially deployed on. The physical servers are exactly the same: same networks, storage, OS, patches, etc. The additional hosts are added thru the HE GUI and are added without issue. Is there a secret button I gotta push? What am I missing? This is with 4.3 on CentOS 7.9. HELP! Thanks. :-)