DiskConfig in Unnattend.xml works with Generation 1 VMs and not in Generation 2

HI all,

My Hyper-v VM, generation 2:

iscsi 0 HDD 32Gb (should be C:) attached to the VM, all switches by default in configuration.

My Unnattend.xml file, which still works with VM´s in generation 1:

<DiskConfiguration><Disk wcm:action="add"><CreatePartitions><CreatePartition wcm:action="add"><Extend>true</Extend><Order>1</Order><Type>Primary</Type></CreateParti</CreatePartitions><ModifyPartitions><ModifyPartition wcm:action="add"><Active>true</Active><Label>OS</Label><Order>1</Order><PartitionID>1</PartitionID></ModifyPartition></ModifyPartitions><DiskID>0</DiskID><WillWipeDisk>true</WillWipeDisk></Disk></DiskConfiguration>

I guess I´m missing anything in the config, but dont get what. All works fine, but in the installation moment I guet the error that "no drive/volume/partition is able to be set as active"

Many thanks in advance, any help appreciated.

Pablo