While trying to add a new user to grant PowerShell script execution policies, Got this error message:
Add-SPShellAdmin: You need to have Machine administrator priviliges to run this cmdlet
Although you are in local server Administrator group, You must run the SharePoint Management Shell as Administrator. Simply right click on SharePoint 2010/2013 Management Shell >> Choose "Run as a administrator"
Alternatively, you can disable the UAC to avoid these kind of issues.
Related article: How to disable UAC in Windows 2012
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