ZFS over ISCSI lun mapping issue

I am trying to migrate a bunch of VMs to a new ZFS over ISCSI box. I have some moved over but suddenly it stopped taking migration.s

when I attempt the migration I get this error.

TASK ERROR: storage migration failed: copy failed: command '/usr/bin/qemu-img convert -p -n -f raw --target-image-opts /dev/hpstorage/vm-159-disk-0...

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