Hi there,

Please try use this commands, it worked for me.

To get snapshots for multiple VMs use this:

Get-VM -Name VM1,VM2,VM3 | New-Snapshot -Name SnapshotNameHere - Description SnapshotDescriptionHere

To delete snapshot for multiple VMs use this

G-VM -Name VM1,VM2,VM3, | Get-Snapshot | Remove-Snapshot

Note: reference VM1,VM2,VM3 to your VMs
Hope that helps