Win 7 Script for Robocopy not working on windows 10

I have a script running robocopy to copy about 1.5 tb of data from one machine to another. Works fine windows 7 machine. But on Windows 10 it doesnt run.
Its something like this (im at home right now & dont have the script with me)
robocopy “\\NetworkMachineSource1\dir\another_dir\ C:\program files\dir\another_dir\ /mir /fx ”

Anyways, from my research today im thinking there is a problem with permissions with computer source and destination with the /mir command.

I tried it with /MIR /SEC and /SECFIX

Anyone encounter this yet? Would really appreciate a response if you can assist me or even point me to the right direction.