So You've installed Windows Server 2016, Logged in as Administrator and you are unable to launch the Microsoft Edge browser.
This is blocked in the Local Security Policy for Windows Server 2016, To enable this please follow the steps below.
Click on start & type in secpol.msc
Or you can also browse, by clicking on Start > All Apps > Windows Administrative Tools > Local Security Policy
In the left pane, Expand "Local Policies" and select " Security Options"
Find: User Account Control: Admin Approval Mode for the Built-in Administrator account
Select "Enabled" then Apply & Ok
You will have to log out & log back in for the changes to take effect