Article ID: 2798911
Using System Center 2012 Virtual Machine Manager SP1 to create or clone a new virtual machine to the cloud and place it on a Citrix XenServer host with a virtual machine name that has an underscore character ( _ ) in it causes the VMM console to crash with the following error:
Cannot place virtual machine <VMName> in cloud <CloudName> due to insufficient cloud resources.
If there already is a VM in the cloud that has an underscore ( _ ) in its name, then the create or clone operation succeeds.
Before creating or cloning a VM with an underscore ( _ ) in its name to a cloud with Citrix XenServer hosts, ensure that there is already at least one virtual machine in the cloud that has an underscore ( _ ) in its name. For example, this can be done by creating a VM in the cloud with the Citrix XenServer hosts without an underscore ( _ ) in its name and then renaming the virtual machine to include the underscore ( _ ).
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.