One of the features implemented by User Access Control (UAC), LocalAccountTokenFilterPolicy, strips any local account of its administrative privileges when logging in remotely. While you can elevate your privileges through UAC from a graphical user session, if you are using WinRM, you are confined to a limited access token with no administrative privileges.
To be able to regain administration privileges from your user, we’ll have to disable LocalAccountTokenFilterPolicy by changing the following registry key to 1:
Command:
reg add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /t REG_DWORD /v LocalAccountTokenFilterPolicy /d 1