@Danp I got around this by using Clonezilla to copy the disks of the 2 VMs I was having an issue with. This is very strange. The VMs booted and ran fine on the old host, I was able to clone them with Clonezilla to the new host where they also boot and run fine. There is something preventing the native tools from migrating these specific disks though.

Ok, I was able to fix this. I migrated it to the pool master on the cli. I don't think this was necessary in hindsight but I just wanted to be sure I knew where it was running. I then brought up xo-lite in Chrome on the pool master. At that point I could view the VM in the embedded console. It turned out that the root partition had errors on it and was stuck in Initramfs waiting for fsck to be run. Once I repaired the errors with fsck, the VM booted and I'm back in business.

My particular setup may be a bit weird but here's a better description. I have my primary pool of servers running at home, and XOA runs there. I have a site-to-site VPN between home and the remote location so I can reach the remote host which is also managed through my XOA instance through the VPN tunnel. I don't need any proxies for this to work because I setup a VPN tunnel and XOA and the remote host have direct IP connectivity. On the remote host, I have a VM that runs in an isolated network not reachable from home, so I cannot connect directly to the guest with VNC. If I'm connected to my home network I can see this guest through XOA. If however I connect to the VPN service at the remote end (different than the site-to-site tunnel) to get access to normal resources on the remote end and also want to use my test VM it becomes difficult to reach the VM because I can't reach my XOA instance back at home easily. I'm not sure a proxy would solve this. I followed the instructions to test XO Lite and that looks like it is sort of what I am looking for. When I log into my remote host I can see the dashboard and the list of guests, but I don't see the console for the guests. Is the console supposed to be present or is the plan for it to be exposed in the future? If so, that would solve my problem.