Disks are 0 indexed... are you trying to move the disk labeled disk 2? If so, this would be disk 3... If you only have two disks, they are Disk 0 and Disk 1 so you would want to specify disk 1 as the one to move to new datastore. In my test, my running VM had 6 disks and I successfully moved disks 0, 1, and 2.
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