question

I have a Windows 10 Home machine (VirtualBox). Its EFI machine, Disk is GPT and Dynamic.
Please refer below image

Following image shows the existing partition

I am trying to install Windows 10 Pro on it using WDS. I don't want to wipe the "Disk 0", but I just want to format the "Partition 4" to NTFS which contains the OS.

Following is portion from my "unattend.xml"

 <component name="Microsoft-Windows-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
             <WindowsDeploymentServices>
                 <Login>
                     <Credentials>
                         <Domain>WIN-FNN9C1R1070</Domain>
                         <Password>somepassword</Password>
                         <Username>someusername</Username>
                     </Credentials>
                 </Login>
                 <ImageSelection>
                     <InstallTo>
                         <DiskID>0</DiskID>
                         <PartitionID>4</PartitionID>
                     </InstallTo>
                     <InstallImage>
                         <Filename>install_img1.wim</Filename>
                         <ImageGroup>InstallImages</ImageGroup>
                         <ImageName>Windows 10 Pro</ImageName>
                     </InstallImage>
                     <WillShowUI>OnError</WillShowUI>
                 </ImageSelection>
             </WindowsDeploymentServices>
             <DiskConfiguration>
                 <Disk wcm:action="add">
                     <DiskID>0</DiskID>
                     <WillWipeDisk>false</WillWipeDisk>
                     <ModifyPartitions>
                         <ModifyPartition wcm:action="add">
                             <Format>NTFS</Format>
                             <Label>C</Label>
                             <Letter>C</Letter>
                             <Order>1</Order>
                             <PartitionID>4</PartitionID>
                         </ModifyPartition>
                     </ModifyPartitions>
                 </Disk>
             </DiskConfiguration>
         </component>![4eptS.jpg][3]

I am getting following error

**> Note::

"Disk 0" is GPT and Dynamic = Error.
"Disk 0" is only GPT and not Dynamic = No Error, Installation Successful.**

I am trying to find the answer for the following questions
1. Why I am getting this error?
2. What is wrong in my "unattend.xml"?
3. What changes I need to do in my "unattend.xml" to make this work?
4. Why I get error only when Disk is both GPT and Dynamic and not when Disk is only GPT?

[3]: https://i.stack.imgur.com/4eptS.jpg