Hyper-V: Kerberos Constrained Delegation not working - unable to create VHD on SMB 3.0 share

I have created a simple, three server Hyper-V environment with two Hyper-V servers and a file server.  The file server is providing shared storage over SMB.  I have configured Constrained Delegation as per the instructions found on a TechNet blog.

However, I cannot create VMs from my Windows 8.1 workstation running the Windows 8.1 RSAT.  I get the following error:

New-VM : Failed to create the virtual hard disk.
The system failed to create '\\SERVER\VHDStore\Hyper-V\VH02\Virtual Hard Disks\Disk1.vhdx': General access denied error (0x80070005).
You do not have permission to perform the operation. Contact your administrator if you believe you should have
permission to perform this operation.+ CategoryInfo : PermissionDenied: (Microsoft.Hyper...l.VMStorageTask:VMStorageTask) [New-VM], Virtualiza
   tionOperationFailedException+ FullyQualifiedErrorId : AccessDenied,Microsoft.HyperV.PowerShell.Commands.NewVMCommand

I have configured delegation on each of the Hyper-V servers to allow the service CIFS on the file server.  The permissions on the shared folder allow full control to both the Hyper-V servers and the end-user account.  I see not specific errors in the event logs on any of the servers involved.  

Where else can I look too determine what is failing and why?

Thanks.

Ash