Did that before. First, ensure you aren’t running on any snapshots. If your VMs have any snapshots, delete them.
If the move function works then use that but I suspect it won’t. You can simply use the “move the vm’s storage” option to ensure the VHD is properly consolidated, then you can put it on the new host and start the VM there (shut it off before moving of course). If your host is running a newer hyper v version you might need to bump the hypervisor version for each VHD in PowerShell, that might take a while but it’s usually fast.