HYPER-V R2 Can not mount ISO from network location (UNC Path)

So, as the name suggest I'm trying to mount a ISO from a network share using the UNC path to a HYPER-V R2 Cluster.

This is a pure Demo / test case setup with:

2x HYPER-V R2
1X NAS/iSCSI CSV Cluster

Management is happening through the MMC with RSAT tools.

So what i've done so far is:

Set up the cluster and configure Quorum, add CSV Shares and disks, set up 1 Virtual Machine on the Hyper-1 node.

What i'm trying to do is, you go to settings —> DVD Drive —> use network location —-> Pick ISO file and press "apply".

Error I'm getting is either "User account does not have rights to mount iso".

I changed that or stopped getting that message when I went to the HYPER-V Node settings and tabbed on:

"Use Default Credentials Automatically".

Now I stopped getting the "user does not have right…" message but I get the following:

Failed to remove device microsoft synthetic DVD Drive:" the specified network resource or device is no longer available"

I've google'd the problem but am unable to find a solution. Anyone here able to help me out ?

Much abbliged !