In response to your question regarding using the add-HD function, I did try it with just the naa.id but that changed nothing.
I tried the script you provided, and got 1 out of 5 disks to be successfully added to the VM.
This disk ID worked - naa.600507681081001ba8000000000006fc
The others give me the same error, even when calling the API using your script:
MethodInvocationException: Exception calling "ReconfigVM" with "1" argument(s): "Incompatible device backing specified for device '0'."
Strangely, I have re-tested using New-Harddisk, and its adding disks this way now, so I'm slightly confused as to what I was doing wrong.
Bare with me, I want to re-test the troubleshooting steps we've been through to see where the issue lies on my side. I will revert back once I have re-tested the disks and found which solution worked.
Your help has been much appreciated so far
