...and logged in using the Domain Administrator account, you may appear to be blocked from carrying out some basic adminstration tasks, including:
You may be presented with the error message below, stating that "Windows cannot access the specified device, path or file. You may not have the appropriate permissions to access the item".
This issue appears to be caused by a missing security policy. This issue has been found to occur on fresh installs on Windows Server when an existing domain administrator account is used, or on upgrade installs of Windows Server (i.e. 2012R2 to 2016) when the same domain administrator account is used.
Edit the local computer security policy to grant