Failed to Live migrate virtual machine, Error Code: 0x8007138d

Windows 2012 HyperV Cluster VM won’t migrate a VM (either through Live Migrate or Move Node), reports the error:
Failed to Live migrate virtual machine ‘ClusterNode1’
Error Code: 0x8007138d



There is no other cluster node available and running normally to move the VM to. In my case, the other node was paused for maintenance.
Look under the “nodes” section to verify the health of the cluster nodes.
Note that this error may be masking an underlying issue – why isn’t the other node available?