Users might face non responsive issue during Regarding your issue, it is by design that you cannot do things as a remote user that UAC would kick in for during control of a desktop sharing session. This is a feature built into the Lync/Skype for Business client for the safety and security of the users.
To judge this behavior, UAC is designed to prevent applications from gaining administrative control. Any solution that bypasses that has to be 100% sure it’s not opening a vulnerability in UAC. Doing this in a communication application that’s usable by federated contacts outside the organisation makes this even more important.
The sad thing is there is no in-built option to bypass this UAC prompt.
There will be a way of bypassing suppressing UAC what you want to do. Group Policy, Remote Registry. – Not necessarily to use any third party tools in Lync/Skype for Business environment for desktop share features. Just because you can’t get a desktop session to a machine doesn’t mean you can’t control it.
Custom codes/scripts can be snipped in Lync/Skype for Business SDKs or you can disable/modify the UAC options .
Mach Pro 
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