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When a HA occur in your cluster, some VMs can remains “disconnected” after a HA failure. HA should normally restart your VM after a host failure.
If your VM is still accessible from another ESX, you can execute a command through ssh.
So , start an ssh session on your host and execute this command line.
vim-cmd solo/registervm /vmfs/volumes/YOURDATASTORE/YOURVM/YOURVM.vmx
Your VMs are not available in your cluster.