This question was missed at time of asking I created a Blog article to allow 2012r2 to remote assist other 2012r2 servers. However, it's not possible to use 2012r2 to remote assist a win7 server. It's simply not supported by MS and there isn't anything we can do.   If you can create a 2008r2 server to run the Management Console, you'll be able to remote assist Win7 VDIs from here.
We have a new VDI Environement with the newest Version of v Workspace 8.0 MR1 and actual Patches. The connection Broker and Hyper-V Hosts are running on Windows Server 2012 R2 Standard with actual Patches. The VDI Clients are set up with Windows 7 Enterprise and RDP8. Unfortunately we are not able to use Remote Assistance by the connection broker ?!  We got the error Message :  The following error occured while shadowing session 2 on server ...... This function is not supported on this system. (120) I have found the link : [URL] or [URL] But this article has no recommendation about Windows Server 2012 R2 Standard Any help I would appreciate. thx in advance Thomas    
Remote Assistance with vWorkspace 8.0 MR1 on a Windows Server 2012 R2 with 
Windows 7 Enterprise VDI (RDP8)